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- Thread starter Haseeb Ali
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CWatters

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Start with the pendulum. Which bit don't you understand? Do you know what PE and KE are?

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Yes .. i know that. I just want you to explain the interconversion of K.E and P.E as pendulum moves to and fro ,Start with the pendulum. Which bit don't you understand? Do you know what PE and KE are?

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russ_watters

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CWatters

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Using Basic trig. you can calculate the bob height and hence the PE at any angle of deflection. Lets call that PE(theta) where theta is the instantaneous angle of deflection.

Then applying conservation of energy...

PE(theta) + KE(theta) = PE

or rearrange that to give

KE(theta) = PE

Edit: Sorry russ_watters is right. That's why I haven't calculated PE(theta) for you.

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