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Homework Help: Force of a falling object

  1. May 1, 2010 #1
    1. The problem statement, all variables and given/known data
    I need to know the force of a falling object.
    m=1.502 kg
    v=0.528 m/s (this value is way off from the theoretical which is .9598 m/s)
    Duration of impact = 0.167 s

    I have all the variable but my problem is this:
    This falling object compresses a spring which needs a force of 21 N to compress. From my experiment, the spring compresses but the calculation doesn't work out. This could be just experimental error but I don't think the margin of error should be this big.


    2. Relevant equations
    F=m∆V/∆t


    3. The attempt at a solution

    F=((1.5025)(0-0.528))/0.167
    F=4.75 N [down]

    F=ma
    F_g=(1.5025)(9.8)
    F_g=14.7245 N [down]

    F_e=kx
    F_e=(512)(0.041)
    F_e=20.992 N [up]

    I was also wondering if you add the two downward forces together. If that is true, then the force using my theoretical value would be correct.
     
    Last edited: May 1, 2010
  2. jcsd
  3. May 2, 2010 #2
    well, if you have two forces pointing downward and you want to find the resulant force you should add them .. im not sure what is the other question you are trying to ask?
     
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