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Homework Help: Work and kinetic energy

  1. Mar 1, 2008 #1
    A hockey puck of mass m sits on a frictionless, horizontal table tied to a string of length L. The puck starts at rest, and accelerates to some speed v moving in a horizontal circle of radius L. The net work done on the hockey puck,depend on what? L,m,or r??

    i forgot the formula for the circular motion.
  2. jcsd
  3. Mar 1, 2008 #2
    acceleration = velocity^2 / radius
    net force = mass*velocity^2 / radius
  4. Mar 2, 2008 #3
    Work done is force x displacement.
  5. Mar 2, 2008 #4

    Doc Al

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    Staff: Mentor

    Hint: Consider the Work-Energy theorem.
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