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Forces question HELP!

  • Thread starter wr1015
  • Start date
  • #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
Mentor
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1,112
What's the net force on the ball?
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,770
911
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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