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Homework Help: Bowling Ball problem

  1. Oct 25, 2006 #1
    A bowling ball is suspended from the ceiling of a lecture hall by a strong cord. The ball is drawn away from its equilibrium position and released from rest at the tip of the demonstrator's nose, as shown in Figure Q5.8.

    q5-8.gif

    If the demonstrator remains stationary, explain why the ball does not strike her on its return swing.

    Would this demonstration be safe if the ball were given a push from its starting position at her nose?

    yes
    no
    I know its no, but I cant put it into words why. Please help

    Explain.
     
  2. jcsd
  3. Oct 25, 2006 #2
    Conservation of energy.
     
  4. Oct 25, 2006 #3
    ^ can you provide a more detailed explanation on both please
     
  5. Oct 25, 2006 #4

    AVD

    User Avatar

    neglecting air resistance, Kinetic energy would be conserved & the ball would not go any further than its starting point (this is common sense)

    However, if there is a push at the beginning, there is an initial kinetic energy, meaning on its return swing, the ball will go further than the point from where it was pushed until Ke = 0. Since Ke did not equal 0 on the initial swing (if there is a push), it would not equal zero at that same point upon its return, meaning it would still be in motion, meaning it would clock her in the face :)

    I know my explanation isn't exactly clear but I hope it helps
     
  6. Oct 26, 2006 #5
    thank u that helped
     
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