1. Sep 18, 2005 #1

   wr1015

   

   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????

    

   wr1015, Sep 18, 2005
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3. Sep 18, 2005 #2

   Doc Al

   

   Staff: Mentor

   What's the net force on the ball?

    

   Doc Al, Sep 18, 2005
4. Sep 18, 2005 #3

   HallsofIvy

   

   Staff Emeritus

   Science Advisor

   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!

    

   HallsofIvy, Sep 18, 2005

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