Forces question HELP!

  • Thread starter wr1015
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  • #1
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When you lift a bowling ball with a force of 82 N, the ball accelerates upward with an acceleration a. If you lift with a force of 99 N, the ball's acceleration is 8 x a.
(a) Find the weight of the bowling ball.
N
(b) Find the acceleration a.
m/s2


Ok, i found part (a), which is 78.48 N. Now, on part (b) why wouldn't the acceleration be 99 N/ 8 kg, which is 12.37 m/s2???? :confused:
 

Answers and Replies

  • #2
Doc Al
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What's the net force on the ball?
 
  • #3
HallsofIvy
Science Advisor
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Did you forget that you have to lift with the weight of the ball just to get it moving at all? The force in "F= ma" is 99N- mg.

As usual, Doc Al got there before me!
 

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