Bowling Ball problem

  • Thread starter parwana
  • Start date
  • #1
182
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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.
 

Answers and Replies

  • #2
121
1
Conservation of energy.
 
  • #3
182
0
^ can you provide a more detailed explanation on both please
 
  • #4
AVD
8
0
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
 
  • #5
182
0
thank u that helped
 

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