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Homework Help: Forces and Systems Lab- Relationship questions

  1. Oct 15, 2007 #1
    I have a lab report due tomorrow on forces. Basically, we were supposed to calculate the kinetic friction of a "frictionless" system on a level place, an incline plane accelerating upwards, and an incline plane accelerating downwards.

    I solved for mk by using the equation m(at + aA)= T-(mk)mg. I also calculated for tension and acceleration.

    *Please note that the first m stands for mass of the sled, the (mk) means the kinetic frictional force, and the final m is the mass of the weight attatched.

    This is my data thus far:

    Experimental Results:

    Acceleration: 4.89
    Tension: .72
    mk: .059

    Downward Incline:
    Acceleration: 6.642
    Tension: .9798
    mk: .087

    Upward Incline:
    Acceleration: 3.078
    Tension: .454
    mk: .039

    Theoretical Results:

    Acceleration: 4.038
    Tension: .596
    mk: .047

    Downward Incline:
    Acceleration: 5.885
    Tension: .868
    mk: .078

    Upward Incline:
    Acceleration: 3.478
    Tension: .513
    mk: .045

    I've made the observation that the greater the acceleration, the greater the frictional force opposing the motion of the object.

    Is that correct or am I missing something? And what am I supposed to incorporate the percent error of the frictional force for?

    Thanks for any help. :]
    Last edited: Oct 15, 2007
  2. jcsd
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