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Homework Help: Spring Compression

  1. Feb 24, 2010 #1
    A 2kg block is placed pushing against a spring. The spring is compressed and stores 10 joules of potential energy. The block remains attached to the spring as it oscillates on a frictionless track.

    The mass experiences zero acceleration when the spring compression is __________
    A. greatest
    B. When velocity is zero
    C. At the equilibrium
    D. Kinetic Energy is zero
    E. Potential energy is greatest

    I have no idea. I think the answer is A. But however I have no concrete reason why. So far I am basing my answer on the fact that when the compression is greatest the block is not moving. Therefore the acceleration is zero, but then again choice B says when the velocity is zero. Any ideas
     
  2. jcsd
  3. Feb 24, 2010 #2

    rl.bhat

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    In the spring the relation between force and compression is given by
    F = -k*x, where k is the spring constant. The acceleration is zero when F is zero.
    Now where the force is zero?
     
  4. Feb 24, 2010 #3
    I'm still confused so the acceleration is o when the compression is kinetic energy is zero
     
  5. Feb 24, 2010 #4

    rl.bhat

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    No. In fact when the acceleration is zero, kinetic energy is maximum. In the oscillating body where the kinetic energy is maximum?
     
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