Simple Harmonic Motion Problem(pendulum)

  • Thread starter JSmith89
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  • #1
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Homework Statement


A simple pendulum is made from a 0.653 m-long string and a small ball attached to its free end. The ball is pulled to one side through a small angle and then released from rest. After the ball is released, how much time elapses before it attains its greatest speed?


Homework Equations



Tpend=2[tex]\pi[/tex][tex]\sqrt{}length/gravity[/tex]

incase that didn't come out right using the symbols: Timeofpend=2pi*the square root of length divided by gravity

The Attempt at a Solution


I used this equation from notes in class and the answer was wrong... I'm not sure whether you need to factor in kinetic energy/potential energy because it's asking the time before it attains the greatest speed or not. I feel like this should be an easy question. Thanks ahead of time! :-)
 

Answers and Replies

  • #2
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Remember your equation gives the time for one complete oscillation. Think of where the pendulum's speed will be a maximum (at which position) during it's swing? The law of conservation of mechanical energy will help you to determine this point.
 
  • #3
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ok got it thanks!
 
  • #4
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