Linear Motion Notes

  1. Want: list variable names:
  2. Have: Variable names, numbers, units
  3. Convert everything to m, s, kg using factor-label.

    1000 m = 1 km      60 s = 1 min      1000 g = 1 kg
    1000 mm = 1 m      60 min = 1 h
    100 cm = 1 m
    10 mm = 1 cm

  4. Equation in which you know everything except one of your "wants."
    EquationVariables
    Δx = xf - xiΔx, xf, xi
    Δt = tf - tiΔt, tf, ti
    Δv = vf - viΔv, vf, vi
    vavg = (Δx)/(Δt)vavg, Δx, Δt
    a = (Δv)/(Δt)a, Δv, Δt
    vf = vi + aΔta, vf, vi, Δt
    Δx = .5(vf+ vi)ΔtΔx, vf, vi, Δt
    Δx = viΔt + .5a(Δt)2Δx, Δt, a, vi

    Can't find an equation that gets what you want? Find something else you can solve for. Having Δt might open up a whole new world of possibilities.
  5. Plug in and solve.