# Homework

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## 1. Final Review (5/22/06-6/12/06)

Homework: Rate of Change Final Review (pdf) (Due: 5/30/06)
• Recognize rate-of-change relationships in many parts of mechanics
• Be able to recognize a rate of change relationship in a new context
• Recognize that physics quantities describe state, change in state (motion), and change in motion of objects, and that the relationship between any two levels involves rate of change.
• Given a graph of position, figure out what the velocity and acceleration graphs must look like.

Homework: Graphs Final Review (pdf) (Due: 5/31/06)
• Read graphs of position, velocity, acceleration, force, energy, and other physics concepts.
• Identify rate of change as the slope of a graph, and determine what the rate of change graph will look like for any given graph.
• Find the area under a graph to determine the change in another graph.
• Read stacked graphs, such as energy graphs.

Homework: Vectors Final Review (pdf) (Due: 6/1/06)
• Add, subtract, and multiply vectors.
• Use vectors in equations as momenta or velocities.
• Resolve an angled vector into components using trigonometry.

Homework: Force Final Review (pdf) (Due: 6/2/06)
• Relate force to other physics quantities such as energy, momentum, and acceleration.
• Know Newton's three laws and see how to apply them to various situations.
• Draw a force diagram for an object, resolving any angled forces, and determine the net force.

Homework: Conservation Final Review (pdf) (Due: 6/5/06)
• Recognize that for a quantity to be conserved means that the total amount of it never changes.
• Apply the laws of conservation of energy, mass, and momentum to various situations.
• Apply conservation of energy to problems involving a graph of energy versus position.
• Apply conservation of energy to problems involving universal gravitation.

Homework: Heat Final Review (pdf) (Due: 6/6/06)
• Recognize that heat is really kinetic energy of molecules, and temperature is average kinetic energy.
• Recognize that phase change involves molecules gaining enough energy to have a higher level of freedom.
• Calculate the heat capacity and heat content of various materials, and use this to find an equilibrium temperature when two are mixed.

Homework: Gravity Final Review (pdf) (Due: 6/7/06)
• Convert to and from scientific notation
• Calculate the gravitational attraction between two objects.
• Calculate the potential energy of an object in orbit.
• Understand and use information about the solar system.

Homework: Electrostatics Final Review (pdf) (Due: 6/8/06)
• Recognize that all matter is made up of atoms, and that atoms contain both protons (positively charged) and electrons (negatively charged). Know that only electrons can move.
• Determine how charged objects will behave around each other, using the rule that like charges repel and opposites attract.
• Explain the phenomena of polarization, conduction, induction, and triboelectrification.

Homework: Circuits Final Review (pdf) (Due: 6/9/06)
• Recognize that an electric current is a flow of electrons, and that a voltage is required to make a current flow.
• Relate current, voltage, and resistance using Ohm's law.
• Apply the rules of Kirchoff's laws and Thevenin equivalents to determine how current will flow through any given circuit.

Homework: Waves and Oscillation Final Review (pdf) (Due: 6/12/06)
• Recognize and relate period, frequency, wavelength, and wave speed.
• Understand how the wavelength of a wave defines its interaction with other objects.
• Recognize the various parts of the electromagnetic spectrum and their effects, sources, and uses.

## 2. Momentum (5/8/06-5/19/06)

Homework: Momentum Conservation (pdf) (Due: 5/9/06)
• Review the equations we used in mechanics (force, energy, and linear motion) and solve problems using them.
• Calculate momentum: p = mv
• Recognize that momentum will be conserved, meaning that the total amount of momentum in any situation is fixed.

Homework: Collisions and Explosions (pdf) (Due: 5/10/06)
• Recognize that because momentum is always conserved, when an object breaks up or two objects stick together, the momentum of the whole is the sum of the momenta of the parts.
• Use vectors in solving collision and explosion problems.
• Review vectors, including drawing them.

Homework: Momentum and Force (pdf) (Due: 5/11/06)
• Recognize that force is the rate of cchange of momentum: F = Δp/Δt.
• Recognize that a large momentum will require a bigger force or a longer time to stop.
• Determine the direction of force in a collision, and recognize it as the mechanism of transfering momentum between the objects.

Homework: Momentum and Energy (pdf) (Due: 5/12/06)
• Recall that energy is also conserved.
• Determine how much energy is lost to heat in a collision in which the start and end state are known.
• Solve problems using just energy and momentum conservation, then verify them in other ways.

Homework: Elastic Collisions (pdf) (Due: 5/15/06)
• Determine the center of mass velocity as the velocity that would result from an inelastic collision.
• Figure out what will happen in an elastic collision by first finding this, then bouncing the objects back to preserve their energy.
• Recognize and apply conceptual rules for 1D collisions between balls of smaller, greater, or equal masses.

Homework: 2D Collisions (pdf) (Due: 5/16/06)
• Recognize that a 2D elastic collision really only happens in one component; the other is unchanged.
• Calculate the result of a 2D elastic collision.

Homework: Collision Rules (pdf) (Due: 5/17/06)
• If a stationary object is struck by a moving one, the behavior of both after the collision depends on whether the stationary object is heavier, lighter, or the same mass as the other.
• Apply collision rules to determine the approximate result of one dimensional and two dimensional collisions.

Homework: Momentum Review (pdf) (Due: 5/18/06)
• Calculate momentum and recognize that it is conserved.
• Relate momentum to other mechanical properties such as force and energy.
• Determine the result of one and two dimensional collisions, elastic and inelastic.

## 3. Light (4/24/06-5/5/06)

Homework: Light (pdf) (Due: 4/25/06)
• Recognize that light is a type of wave.
• Know that the medium that light travels through is electric and magnetic fields, which allows light to go through space, where there is no matter to oscillate.
• Know that light always travels at a speed of 3×108 m/s.

Homework: Electromagnetic Spectrum (pdf) (Due: 4/26/06)
• Recognize that visible light is just a tiny part of the entire spectrum of frequencies of electromagnetic radiation.
• Recognize the order of the parts of the spectrum, and know what we use each part for.
• Understand the relationship between wavelength and frequency and recognize that wavelength relates to the size of the object producing a wave.

Homework: Types of Light (pdf) (Due: 4/27/06)
• Waves are produces by oscillation and make objects oscillate. Know the causes and effects of light:
• Oscillation of electrons in large objects like an antenna (radio)
• Molecular motion, like rotation of water molecules (microwave) or heat vibration (infrared through ultraviolet)
• Electrons within an atom moving between energy levels (infrared through x-ray)
• Transfomations within the nucleus of an atom (gamma rays)

Homework: Light and Energy (pdf) (Due: 4/28/06)
• Recognize that light is emitted in discrete packets called photons.
• Find the energy of a photon: E = hf, where h = 6.626×10-34 J/Hz
• Relate photon energy to the energy level transitions in an atom.
• Recognize that higher frequencies are more energetic and therefore more dangerous.

Homework: Light and Temperature (pdf) (Due: 5/1/06)
• Recognize that all objects "glow" with a wavelength dependent on their temperature.
• Recognize that because the energy of individual molecules varies, thermal radiation produces a broad, continuous spectrum of frequencies.
• Calculate the peak wavelength of thermal emission: λ = .0029 / T, for T in Kelvins

Homework: Reflection (pdf) (Due: 5/2/06)
• Understand the basic principal of reflection: a light ray reflects back from a mirror at the same angle it hit.
• Trace out the paths of rays of light hitting a mirror of any shape, by duplicating angles.
• Recognize that certain mirror focus parallel light beams to a certain focal point.
• Use parallel rays and rays through the center of a mirror to locate the image of an object.

Homework: Refraction (pdf) (Due: 5/3/06)
• Recognize that light travels more slowly in water or glass than it does in air.
• Recognize that this changes the wavelength, not the frequency, of the light.
• Recognize that because of this, light that comes in at an angle needs to bend its angle.
• Understand that light going into a less dense material will bend toward the surface, and light going into a more dense material will bend away.

Homework: Light Review (pdf) (Due: 5/4/06)
• Recognize that light is an electromagnetic wave that travels with a speed of 3×108 m/s
• Identify the different parts of the electromagnetic spectrum and our uses for them.
• Identify characteristics such as wavelength, frequency, energy, temperature, and size of emitters and receivers, and how they are related.
• Trace the path of light rays in reflection and refraction.

## 4. Waves and Sound (3/27/06-4/13/06

Homework: Waves (pdf) (Due: 3/31/06)
• Recognize four properties of a wave: period, frequency, wavelength, and wave speed.
• Understand that a wave is like a moving oscillation.
• Use the ideas of wavelength to discuss similar situations like people walking.

Homework: Wave Reflection (pdf) (Due: 4/3/06)
• Recongnize that most waves travel through some medium like a rope, water, or air, and that the medium determines the speed of the wave.
• Deal with wave pulses as a simple example of a traveling wave.
• Determine how a pulse will reflect from a closed or open end of the medium.

Homework: Wave Interference (pdf) (Due: 4/4/06)
• Recognize that when two waves in the same medium overlap, they interfere.
• Understand the difference between constructive and destructive interference.
• Recognize the effects of two waves being in phase or out of phase.

Homework: Standing Waves (pdf) (Due: 4/5/06)
• Recognize that a standing wave forms when a medium is bounded at both ends and the total distance a wave has to travel to return to its start position is a multiple of its wavelength.
• Identify the nodes and antinodes in a standing wave.
• Classify standing waves as mode 1, mode 2, etc. based on the number of nodes and antinodes.
• Relate the wavelength of the standing wave to the length of the rope.

Homework: Wave Speed (pdf) (Due: 4/6/06)
• Recognize that the speed of a wave is dependent on the medium it is traveling in.
• Recognize that sound travels faster in denser materials.
• Calculate the wave speed in a rope given the linear density and the tension force.
• Apply these ideas to figuring out how far a wave travels or with what frequency a standing wave forms.

Homework: Sound (pdf) (Due: 4/7/06)
• Understand the difference between transverse and longitudinal waves.
• Recognize that sound can travel through any type of matter, not just air.
• Recognize that sound travels faster in denser materials.
• Calculate the frequency of a standing wave in a simple musical instrument.

Homework: Music (pdf) (Due: 4/10/06)
• The frequency of a sound wave is what determines its musical pitch.
• Recognize that the frequency of a vibration does not change when it transfers to another medium.
• Two notes are an octave apart if one is double the frequency of the other.
• Two notes that sound good together have frequencies in a simple ratio to each other.

Homework: Musical Instruments (pdf) (Due: 4/11/06)
• Calculate the resistance of a section of pipe using the area and length.
• Calculate the resistance of an instrument using Thevenin equivalents.
• Find the acoustic length and thus the frequency of an instrument.

Homework: Waves Review (pdf) (Due: 4/12/06)
• Recognize that a wave is an oscillation traveling through a medium.
• Determine the properties of a wave and understand different waves that waves can travel.
• Recognize that waves can reflect and interfere, and that this gives rise to standing waves in a bounded medium.
• Calculate the frequency of various modes of standing wave in a given medium.
• Recognize that sound is a wave, and that it travels through air with a speed of 345 m/s.

## 5. Oscillation (3/10/06-3/24/06)

Homework: Equilibrium and Oscillation (pdf) (Due: 3/13/06)
• A situation is in equilibrium if it is balanced and unchanging.
• An equilibrium is unstable if a slight change will cause it to fall out of equilibrium.
• If a situation is in stable equilibrium, and there is something (like inertia) that causes it to constantly swing past that equilibrium, we say that it will oscillate: move back and forth.
• Rate of oscillation is measured with two values: the period, or how long it takes to oscillate once, and the frequency, or how many times it oscillates in a second.

Homework: Hooke's Law (pdf) (Due: 3/14/06)
• The more a spring stretches, the more it wants to spring back.
• The spring constant of a spring says how much force it exerts per meter of stretch.
• A stronger spring has a larger spring constant.

Homework: Hooke's Law 2 (pdf) (Due: 3/15/06)
• Review drawing force diagrams.
• Figure out what forces are acting on an object hanging from a spring, and explain why this satisfies the criteria for an oscillator: a force pulling back toward the equilibrium point, with an inertia that carries it past that point.

Homework: Harmonic Oscillators 1 (pdf) (Due: 3/16/06)
• Use Hooke's law and the mass-spring oscillator period equation.
• A harmonic oscillator is special because no matter how far back and forth it is oscillating, it has the same period.

Homework: Harmonic Oscillators 1.5 (pdf) (Due: 3/20/06)
• Review equilibrium, oscillation, period, and frequency.
• Recognize that a harmonic oscillator will only oscillate at one particular frequency, no matter how I move it.
• Recognize the affect of mass and spring constant on an oscillator's period.

Homework: Harmonic Oscillators 2 (pdf) (Due: 3/21/06)
• Harmonic oscillation occurs when the force pushing back toward the center (the "restoring force") is proportional to the distance from the center (the "displacement").
• Any time that I can write an equation where the acceleration is something times the displacement, the period will be equal to 2π times the square root of that "something".

Homework: Resonance (pdf) (Due: 3/22/06)
• When a harmonic oscillator is connected to something else oscillating at that same frequency, it will also start to oscillate.
• There are many examples of this in our daily life, such as swinging on a swing set.
• This results in energy being transfered from one oscillator to the other.

Homework: Oscillation Review (pdf) (Due: 3/23/06)
• A situation is in equilibrim if it is balanced and unmoving.
• Equilibrium is stable if pushing the situation out of equilibrium makes it swing back.
• A stable equilibrium will oscillate if there is some sort of inertia making it swing past the middle.
• An oscillation will be harmonic if the force pushing back toward the middle is proportional to the distance from the middle.
• A harmonic oscillator takes the same time to oscillate once regardless of how far it is moving.

## 6. Heat (2/27/06-3/9/06)

Homework: Heat Transfer (pdf) (Due: 2/28/06)
• Recognize that what we sense as hot or cold is really our nerves telling us that heat is traveling into our out of our skin.
• Recognize that heat will travel from a warmer object to a cooler one.
• Understand that when two objects are at the same temperature, heat stops flowing, and we say that they are in thermal equilibrium.

Homework: Temperature (pdf) (Due: 3/1/06)
• Understand that temperature is what we use to measure how hot or cold an object is.
• Recognize that as time goes on, objects that are in contact will want to equalize their temperatures.
• Know some factors, such as insulation, amount of area in contact, and difference in temperature, that affect how quickly heat flows.
• Convert between the three main temperature scales: °F, °C, and K.

Homework: Heat and Temperature (pdf) (Due: 3/2/06)
• Recognize that temperature is how much kinetic energy each molecule in an object has, whereas heat energy is the total kinetic energy of all the molecules.
• Relate temperature, number of molecules, and total heat energy, using simplified units.
• Using simplified units, calculate the equilibrium temperature, when two objects are put together, by calculating how much heat energy there is in each object and spreading that out over all the molecules in the two objects.

Homework: Heat Capacity (pdf) (Due: 3/3/06)
• Understand that heat capacity determines how much heat it takes to change the temperature of an object by 1 °C.
• Understand that different materials have different specific heat capacities that determine how much heat capacity an object of that material has per kilogram.
• Calculate the total amount of heat energy present in an object by multiplying its heat capacity by its temperature in Kelvins.
• Calculate the equilibrium temperature of two objects by dividing their total heat by their total heat capacity.

Homework: Heat and Insulation (pdf) (Due: 3/6/06)
• Recognize that some materials allow heat to transfer more easily.
• Recognize that a thicker barrier is a better insulator, and that the more area something has, the faster heat transfers out of it.
• Calculate the rate of heat loss across a given barrier, and relate this to change in temperature.

Homework: Phase Change (pdf) (Due: 3/7/06)
• Matter can exist in an of three phases: solid, liquid, or gas.
• In a liquid, the molecules are more free to move around than they are in a solid, and in a gas they are the freest of all.
• Energy is required to give molecules this freedom.
• The energy required to melt or boil one kilogram of a material is called the specific heat of melting or of boiling.

Homework: Heat Review (pdf) (Due: 3/8/06)
• Recognize that heat is a type of energy, in the form of vibration of atoms, that will transfer from hotter objects to colder ones.
• Understand that temperature is based on the average kinetic energy of one molecule.
• Convert between the various temperature scales.
• Use heat capacity to relate temperature to heat energy. The heat capacity of an object is how much energy it takes to raise that object's temperature by one degree Celsius.
• Relate heat energy to power, calculating the power escaping through a wall or using the power produced by something to figure out how much a room will be heated.
• Recognize situations where matter is changing phase, and know that during a phase change, the temperature remains constant and the energy is used to break bonds rather than to heat molecules.

## 7. Electrical Circuits (2/3/06-2/17/06)

Homework: Electrostatic Potential (pdf) (Due: 2/6/06)
• Recognize that voltage is electrical potential energy.
• Recognize that electrons want to move toward positve voltage and protons toward negative.
• Recognize that the voltage is the same everywhere in a conductor.
• Recognize that these two rules explain everything we saw in electrostatics and fields.

Homework: Ohm's Law (pdf) (Due: 2/7/06)
• Apply Ohm's law to find the current, voltage, or resistance of any component given the other quantities.
• Recognize that Ohm's law is saying that the amount of current depends on a slope: the amount of voltage drop per ohm of resistance.
• Understand that many resistors in a line combine their resistance, but that separate branches each draw their own current from the same voltage.

Homework: Ohm's Law 2 (pdf) (Due: 2/8/06)
• Know what size of voltages, currents, and resistances you expect to find in a real circuit.
• Solve more complex circuits problems using just Ohm's Law

Homework: Kirchoff's Laws (pdf) (Due: 2/9/06)
• Apply Kirchoff's current law: that the current into any level equals the current out.
• Apply Kichoff's voltage law: that the total voltage drop is the same over any path you can take between two levels.
• Write equations in terms of currents that represent these facts.
• Use Ohm's law to determine the voltage drop over any one resistor, in terms of the current.
• Solve problems that can be solved with sequential application of Kirchoff's Laws

Homework: Kirchoff's Laws 2 (pdf) (Due: 2/10/06)
• Solve problems that require only sequential application of Kirchoff's Laws.
• Solve problems by writing out all the voltage and current law equations and then solving by substitution.

Homework: Kirchoff's Laws 3 (pdf) (Due: 2/14/06)
• Recognize that Ohm's law deals with a single current going through a single resistor, and that the V is just the voltage drop from one end of that current to the other.
• Deal on an intuitive level with Kirchoff's laws.
• Solve any circuit, determining all the voltages, by writing out and solving the Kirchoff's law equations.

Homework: Thevenin Equivalents (pdf) (Due: 2/15/06)
• Find the Thevenin equivalent resistance of any collection of resistors.
• Recognize that in general, two resistors in parallel will have less resistance than either alone, while two resistors in series will have the combined resistance of each alone.
• Relate resistors to traffic jams - recognize that when two paths are open, the conductances add, while when two traffic jams are on the same street, the resistances add.

Homework: Circuits and Power (pdf) (Due: 2/16/06)
• Determine the power dissipated by a whole circuit or any component.
• Relate power to production of heat energy.
• Relate power to brightness of a light.
• By using the relationship of power to work, determine how long a battery will last.

Homework: Circuits Review (pdf) (2/16/06)
• Understand Ohm's Law, Kirchoff's Laws, and Thevenin equivalents, and know where to apply each.
• Solve circuits using any combination of the above.
• Understand what voltage, current, and resistance are and what values for each are expected in real-life circuits.
• Relate circuits to power and energy.

## 8. Electrostatics (1/20/06-2/2/06)

Homework: Triboelectrification (pdf) (Due: 1/23/06)
• Recognize that matter is comprised of protons (positive charge), fixed in place, which form the structure of the matter, and electrons (negative charge), which are free to move.
• Recognize that most objects are neutrally charged because each electron in them is paired with a proton.
• Recognize that two objects with the same sort of charge will be pushed away from each other, while two objects with the same sort of charge will be attracted.
• Recognize that some objects have a greater hold on their electrons than others, and might steal electrons from other objects as a result.

Homework: Conduction (pdf) (Due: 1/24/06)
• Recognize that matter is comprised of protons (positive charge), fixed in place, which form the structure of the matter, and electrons (negative charge), which are free to move.
• Recognize that individual electrons will try to run toward a positively charged object or away from a negatively charged one.
• Understand that some materials, such as metals, allow electrons to be freely conducted around, while others fix electrons in place.

Homework: Polarization (pdf) (Due: 1/25/06)
• Recognize that matter is comprised of protons (positive charge), fixed in place, which form the structure of the matter, and electrons (negative charge), which are free to move.
• Recognize that individual electrons will try to run toward a positively charged object or away from a negatively charged one.
• Explain how polarization results in neutrally charged objects being attracted to positively charged ones.

Homework: Charge by Induction (pdf) (Due: 1/26/06)
• Recognize that matter is comprised of protons (positive charge), fixed in place, which form the structure of the matter, and electrons (negative charge), which are free to move.
• Recognize that individual electrons will try to run toward a positively charged object or away from a negatively charged one.
• Understand that charging by induction is just separating the parts of a polarized object.
• Understand why it is necessary to break contack while still polarized for induction to happen.

Homework: Electric Fields (pdf) (Due: 1/27/06)
• An electric field has lines showing the direction a positive charge would be pushed.
• Field lines should start at positive charges and end at negative.
• Nearness of field lines indicates the strength of the field.
• Negative particles would travel against the field.

Homework: Using Fields (pdf) (Due: 1/30/06)
• An electric field has lines showing the direction a positive charge would be pushed.
• Field lines should start at positive charges and end at negative.
• Nearness of field lines indicates the strength of the field.
• Negative particles would travel against the field.
• Neutral particles move toward stronger field.
• There may be points where the field is zero.

Homework: Gauss' Law (pdf) (Due: 1/31/06)
• The total amouont of field going through any closed surface depends only on how much charge is within it.
• Gauss' law helps us understand the strength of a field between the lines.
• This is like saying that the field is something projected out by the charge that never gets lost.
• Gauss' law is how the field strength equations are found.

Homework: Electrostatics Review (pdf) (Due: 2/1/06)
• Predict the motion of charges in the presence of charged objects.
• Explain conduction, polarization, induction, and triboelectrification in terms of charged particles.
• Read, interpret, and create electrical fields.

## 9. Field Forces (1/4/06-1/19/06)

Homework: Place Value (pdf) (Due: 1/5/06)
• Recognize that in a place value system, every object in a particular place has a value determined by that place.
• Be able to convert from a number to a place value representation and vice versa.
• Understand why addition and subtraction work the way they do in a place value system.

Homework: Base Systems (pdf) (Due: 1/6/06)
• Convert between decimal and other bases.
• Perform addition and subtraction in other bases.
• Understand why the addition and subtraction algorithms work as they do.

Homework: Scientific Notation (pdf) (Due: 1/9/06)
• Convert number from standard form into scientific notation, and vice versa.
• Recognize that in scientifica notation, the digits and the information about what place they go in are separated.
• Recognize that the size of a number is determined promarily by the power, not the mantissa.

Homework: Using Scientific Notation (pdf) (Due: 1/10/06)
• Multiply and divide numbers in scientific notation.
• Recall rules for simplifying expressions that involve multiplying and dividing exponents
• Be aware that when adding numbers in scientific notation, the one that has a smaller exponent will not contribute much the the result.

Homework: Big and Small (pdf) (Due: 1/11/06)
• Predict the approximate size of some value using common sense and powers of ten.
• Recognize numbers as big, small, or nearly 1, and understand the results when adding, subtracting, multiplying, or dividing them.

Homework: Number Sense (pdf) (Due: 1/12/06)
• Be able to convert between fractions, decimals, and percentages when working with a number close to 1.
• Be able to visualize the size of a number between 0 and 1.
• Be able to quickly judge which of two numbers, in different forms, is greater.
• Be able to quickly judge whether a number is greater than 1/2.

Homework: Field Force (pdf) (Due: 1/13/06)
• Recognize charge as a property that an object has, and know that it is measured in Coulombs (C).
• Use the equations for two types of field force, gravitational and electric.
• Understand that gravity is comparatively much smaller, which is why it is primarily noticeable near planet-sized objects.
• Understand as a corollary that gravity typically acts over very large distances and electrical attraction over very long distances.

Homework: Fields and Energy (pdf) (Due: 1/17/06)
• Use the potential energy equations to find the energy due to a field force.
• Recognize that this energy characterizzes how much is "binding" two objects together, and that giving an object more than this amount of kinetic energy sets it free.

Homework: Field Forces Review (pdf) (Due: 1/18/06)
• Use scientific notation in solving problems.
• Convert with ease between fractions, decimals, and percents.
• Solve problems using the field equations.
• Recognize important differnces between the two types of fields.

## 10. Energy (12/02/05-12/22/05)

Homework: Conservation of Energy (pdf) (Due: 12/5/05)
• Energy is the capacity to do work; it makes something "dangerous."
• A moving object has kinetic energy.
• An object lifted above the ground has potential energy.
• The total amount of energy in any situation doesn't change over time.

Homework: Potential Energy (pdf) (Due: 12/6/05)
• The more weight an object has and the higher up it is, the more potential energy it has.
• The equation for this is PEg = mgh, where the subscript "g" stands for "gravitational".
• Solve problems involving figuring out how much kinetic or potential energy changes when an object moves from one position to another.

Homework: Kinetic Energy (pdf) (Due: 12/7/05)
• Recognize that kinetic energy is bigger for an object with bigger mass or faster velocity.
• Calculate kinetic energy: KE = ½mv²
• Solve problems that involve finding the speed of a projectile at various heights, and vice versa.

Homework: Energy Graphs (pdf) (Due: 12/8/05)
• Read an energy graph, determining the total, potential, and kinetic energy at any position.
• Determine how far an object will roll on an energy graph.
• Determine when an object is moving quickly, slowly, or stopped on an energy graph.

Homework: Adding Graphs (pdf) (Due: 12/9/05)
• Read the potential, kinetic, and total energy off of an energy graph.
• Describe when on an energy graph the object is speeding up or slowing down.
• Read a graph with multiple types of potential energy added together.
• Recognize the shape of gravitational potential on a height-versus-energy graph.

Homework: Mystery Graphs (pdf) (Due: 12/12/05)
• Use a know portion of an energy graph, and information about where on the graph an object rolls to and from, to trace out the potential of the unknown part.

Homework: Work and Force (pdf) (Due: 12/13/05)
• Recognize that pushing an object while it moves some distance changes its energy.
• Identify situations where the work is positive or negative.
• Use the rate-of-change equation F = ΔE / Δs.

Homework: Work on a Graph (pdf) (Due: 12/14/05)
• Recognize that a force will cause the total energy line of an object to slope.
• Recognize that the slope of a hill is the force needed to roll the object up it.
• Determine the work being done on an object at various points on a graph by the slope of its total energy.

Homework: Friction Graphs (pdf) (Due: 12/15/05)
• Recognize that friction will give the total energy line a downward slope equal to the friction force.
• Determine where on a grap an object acted on by friction will stop.
• Determine using the rate of change equation or a graph how far the object will roll, in total, before stopping.

Homework: Force Graphs (pdf) (Due: 12/16/05)
• Draw a graph of force versus position, given a graph of energy.
• Draw an energy graph given the force graph.
• Use an energy graph generated in this way to answer questions about the object's potential and kinetic energy at various points in its journey.

Homework: Energy Review (pdf) (Due: 12/19/05)
• Use equations to find potential and kinetic energy, and relate these with the law of conservation of energy.
• Use the work-force relationship to solve problems where the total energy of an object is changing.
• Use graphs to represtne problems where an object has a varying amount of potential, kinetic, and total energy as it moves from position ot position.
• Be able to generate a force graph from an energy graph and vice versa.

## 11. Force (11/08/05-12/01/05)

Homework: Inertia (pdf) (Due: 11/9/05)
• Recognize that mass gives an object inertia, a tendency to resist acceleration.
• Understand in terms of inertia why heavier objects (car, bowling ball) are harder to move than lighter ones (bicycle, baseball).
• Know Newton's first law, that the motion of an object changes only if there is a force exerted on it.

Homework: Newton's Second Law (pdf) (Due: 11/10/05)
• Know Newton's second law: F = ma
• When looking at an equation, be able to say how a change in one variable will change another variable
• Recognize newton's second law as an expression, mathematically, of what we know about inertia

Homework: Force Diagrams (pdf) (Due: 11/14/05)
• Draw force diagrams with forces in the horizontal and vertical directions.
• Determine the net force from a force diagram.
• Determine the missing forces in a force diagram, given the net force.
• Recognize that the net force is what is used in Newton's second law.
• Recognize that no acceleration means a net force of zero.

Homework: Friction (pdf) (Due: 11/15/05)
• Be familiar with the idea of μ, the coefficient of friction, representing how sticky a surface is.
• Know how μ relates the friction force and the normal force.
• Recognize that pressing two surfaces together more increases the force required to slide them past each other, and that the normal force is the force with which two surfaces are pushed together.
• Be able to solve out force diagrams involving normal, gravity, friction, and applied forces, acting in either the vertical or the horizontal direction.

Homework: Trigonometry (pdf) (Due: 11/16/05)
• Recognize that the trig functions give a ratio between two sides of a right triangle.
• Recognize that the angles of a triangle sum to 180°, so that if one is a right angle the other two must add up to 90°.
• Be able to solve for any side of a right triangle given one side and one of the acute angles.

Homework: Resolving Components (pdf) (Due: 11/17/05)
• Given an angle, construct a useful triangle on which to apply trig.
• Given a force and the angle at which it is pulling, "resolve" it into and components.
• Find the net force when several angled forces are added.

Homework: Balancing Forces 1 (pdf) (Due: 11/18/05)
• Given a force diagram with many forces, some of them at an angle, determine the net force, or the strength of any missing force.
• Recognize that any part of an object has its own force diagram, and must balance individually.
• Be aware of the ways that friction and normal forces are deceptively intertwined.

Homework: Balancing Forces 2 (pdf) (Due: 11/21/05)
• Be able to find the strength of a force, given one of its components.
• Be able to find the net force from acceleration and use that to solve a force diagram.

Homework: Force Diagrams Review (pdf) (Due: 11/22/05)
• Identify what sort of forces are acting on an object: gravity, normal, tension, friction, applied.
• Recognize that forces add as vectors, and find the net force.
• Using trigonometry, find a componnt given the full force, or find the force given a component.

Homework: Free Body Diagrams (pdf) (Due: 11/29/05)
• Know and apply Newton's third law.
• Be able to sketch the force diagrams for several objects, given the requirement of matching force pairs.
• By recognizing force pairs, determine in what way several objects must be in contact with each other.

Homework: Force Review (pdf) (Due: 11/30/05)
• Know and apply Newton's three laws.
• Draw force diagrams representing any given situation.
• Use equations to find the acceleration, coefficient of friction, and gravity force.
• Balance a force diagram, resolving forces into components as needed.

## 12. Vectors (10/26/05-11/07/05)

Activity / Homework: Vector Treasure Hunt (Due: 10/27/05)
• Lab introduces the concept of vectors as directions.
• A vector has two components, x and y. It changes both coordinates of my position.
• Be able to separate out components and add them each up individually.

Homework: Adding Vectors (pdf) (Due: 10/28/05)
• Recognize that a vector is merely a description of how much the x and y coordinates of something change by.
• Determine the vector between two given (x, y) points.
• Add vectors, recognizing that the components add separately.
• Add vectors graphically by head-to-tail placing.

Homework: Subtracting Vectors (pdf) (Due: 10/31/05)
• Determine change for vector quantities and for coordinates.
• Recognize that position, velocity, and acceleration are vectors.
• Subtract vectors algebraically and graphically.
• Be very careful to follow the distributive property.

Homework: Scaling Vectors (pdf) (Due: 11/1/05)
• Be able to scale a vector graphically or algebraically.
• Find rate of change of a vector.
• Use vectors in simple equations.
• Recognize that time is a "scalar".

Homework: Projectile Motion (pdf) (Due: 11/2/05)
• Use separation of components to determine when a projectile will hit the ground.
• Use the free fall graphs then dealing with projectiles.
• Recognize that in the horizontal direction, the speed of a projectile is constant.

Homework: Vectors Review (pdf) (Due: 11/4/05)
• Determine the vector difference between two (x, y) positions.
• Add, subtract, and scale vectors.
• Use vectors in the motion equations, recognizing that position, velocity, and acceleration are vectors and time is a scalar.
• Solve projectile motion problems.

## 13. Linear Motion (9/28/05-10/25/05)

Homework: Motion Graphs (pdf) (Due: 9/29/05)
• Create a position versus time graph representing a person's motion.
• Read position and time data from a graph.
• Relate the shape of a graph to the motion of an object.

Homework: Velocity and Speed (pdf) (Due: 9/30/05)
• Determine from a position graph at what time an object was moving forward, backwards, changing direction, or standing still.
• Determine the velocity of an object by finding the slope of a position graph.
• Recognize that velocity contains information about both speed and direction, whereas speed has no direction.

Homework: Acceleration (pdf) (Due: 10/3/05)
• Recognize acceleration and direction of acceleration in a graph.
• Be able to describe an object in a graph as speeding up or slowing down.

Homework: Motion Sensor Homework (pdf) (Due: 10/4/05)
• Read graphs of position, velocity, and acceleration versus time.
• Connect what you knwo about velocity and acceleration on position graphs to velocity and acceleration graphs.
• Recognize that all three graphs are dealing with the same times.

Homework: Multiple Objects (pdf) (Due: 10/5/05)
• Recognize what sort of story is being told by a position graph with multiple objects.
• Be able to recognize when two objects meet, how far apart they are at some time, and how much of a difference in time there is between when they reach somme position.
• Be able to make a multiple-object graph that tells a given story.

Homework: Rate of Change (pdf) (Due: 10/6/05)
• Determine the change in a variable by subtracting the final value from the initial.
• Determine the rate of change of one variable with respect to another, by dividing the change in the first variable by the change in the second variable.
• Recognize that slope is a rate of change.
• Recognize that velocity is the rate of change of position, and that acceleration is the rate of change of velocity.

Homework: Average Velocity (pdf) (Due: 10/7/05)
• Use the average velocity equations to determine how far an object will move while accelerating, given its start and end velocities.
• Solve for any variable in the joined equation, given the other variables' values.
• Relate these equations to what you know about graphs.

Homework: Constant Acceleration (pdf) (10/11/05)
• Use the equation Δs = viΔt + ½aΔt²
• Recognize that the equations for determining displacement from acceleration require that you be dealing with a time of constant acceleration.
• Recognize how this equation relates to graphs, and be able to plot the position graph it predicts.

Homework: Equations Review (pdf) (Due: 10/13/05)
• Practice using the seven linear motion equations.
• Be able to identify which variable(s) are present in a problem statement.
• Be able to quickly (in one line) solve any equation for any variable.

Homework: Free Fall (pdf) (Due: 10/14/05)
• Use the free fall acceleration of -9.8 m/s² in dealing with problems with thrown or released objects.
• Be comfortable dealing with both horizontal and vertical motion.

Homework: Linear Motion Equations (pdf) (Due: 10/17/05)
• Review and organize all the equations we have used in linear motion
• Know how to choose whcih equation to use in a problem
• Deal comfortably with problems that ask you to use two equations to arrive at the answer

Homework: Free Fall Graphs (pdf) (Due: 10/18/05)
• Use the free fall displacement and velocity graphs to answer questions
• Be able to translate the requirements of a problem into a set of statements about the graph of an object's motion
• Understand why this is a powerful tool

Homework: Using Slope (pdf) (Due: 10/19/05)
• Determine the slope of a graph.
• Use slope to find velocity from a position graph and acceleration from a velocity graph.
• Determine slope even at a point where the graph is not a straight line, by drawing a tangent.

Homework: Velocity Graphs (pdf) (Due: 10/20/05)
• Understand and use graphs of position, velocity, and acceleration versus time.
• Generate the other two graphs from any one of these (and appropriate starting conditions).
• Answer questions that require you to read several graphs, connecting them through the time coordinate.

Homework: Linear Motion Review (pdf) (Due: 10/21/05)
• Read information from graphs, including position, time, and sign of acceleration and velocity.
• Generate the other graphs from any one of acceleration, velocity, or position.
• Use the linear motion equations, and pick intelligently which to use.

## 14. Units (9/8/05-9/27/05)

Homework: Unitary Puzzles (pdf) (Due: 9/13/05)
• Using the Unitary game, practice thinking about what combinations of units are needed to make other units.
• Practice multiplying, dividing, and canceling algebraic expressions made up of variables.

Homework: Cards to Equations (pdf) (Due: 9/14/05)
• Recognize that in Unitary, playing a card represents multiplying by its units, and playing a card upside-down represents dividing by it.
• Be able to generate an equation from a string of Unitary plays.
• Using skills from Unitary, be able to predict an equation that will link values with known units.

Homework: Dimensional Analysis (pdf) (Due: 9/15/05)
• Pick out of a problem what physics quantities you have values for, and what their units are.
• In any quantitative (numerical) problem, list out what you have, what you want, what equation you will use, and what the answer is.
• In the absence of any better way to solve the problem, be able to create an equation that puts together those units to get the sort of units you want.

Homework: Units in Experiments (pdf) (Due: 9/16/05)
• Guess what physics quantities might matter in an experiment, by imagining what would happen if you changed that quantity. You will get much better at this later in the year, once you actually understand intuitively what all these quantities mean!
• Set up an experiment to compare actual measured results to the results predicted by a hypothesis equation generated through dimensional analysis.
• Revise that equation by adding a constant factor to make the predictions match the results.

Homework: Checking Units (pdf) (Due: 9/21/05)
• Be aware that rather than names, we usually use one-letter variables to represent physics quantities, possibly with other letters attached to further describe them.
• Evaluate a mathematical expression involving both numbers and units, by working out first the numbers, then the units.
• Be aware that when squaring or square rooting an expression, both units and numbers are affected.
• Use units to check yourself for mathematical errors.

Homework: Factor-Label Conversions (pdf) (Due: 9/22/05)
• Convert using the factor-label procedure.
• Be able to do this even when complex units are involved.
• Be aware that all measurements in physics must be converted to kg, m, and s.
• Know that 1 m = 100 cm, 1 kg = 1000 g.

Homework: Symbolic Manipulation (pdf) (Due: 9/23/05)
• Solve an equation for any given variable.
• Know how to reverse any operation.
• Use order of operations to figure out what the last thing done to a variable was.
• Use a given physics equation to solve for any one of the variables in it.

Homework: Units Review (pdf) (Due: 9/26/05)
• Use dimensional analysis to determine what equation relates some quantities, based on how their units go together.
• Use factor-label conversion to convert any simple or complex measurement into a standard kg-m-s units.
• Use symbolic manipulation to solve any equation for any variable.