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Difficult problems, im frustrated

  1. Mar 2, 2008 #1
    Difficult problems, im frustrated!!

    1.)A chair of mass 10.1 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force of 47.7 N that is directed at an angle of 39.6 degrees below the horizontal and the chair slides along the floor. Calculate the normal force that the floor exerts on the chair

    2.)A 87.7 kg man steps off a platform 2.89 m above the ground. He keeps his legs straight as he falls, but at the moment his feet touch the ground his knees begin to bend, and, treated as a particle, he moves an additional 0.60 m before coming to rest. Treating our rigid legged friend as a particle, what is the average force his feet exert on the ground while he slows down?

    Note: Assume the acceleration while he is slowing down is constant
    Please also remember to try and explain as much as possible. Thanks!
  2. jcsd
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