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Please accept my apologies for my poor English.

As a general Example:

I have a Pendulum of length L with Angle Theta as maximum displacement.

## Homework Statement

:As a general Example:

I have a Pendulum of length L with Angle Theta as maximum displacement.

I know how to solve these problems. Find the period, the speed etc.

But,

I think I'm missing something fundamental here.

I would be very glad if you could help me understand.

So when the Pendulum is at maximum displacement it is also at maximum height in it's oscillation.

Which means it has the most potential energy in mgh.

So when it's in the middle shouldn't the total energy be 1/2Iw

^{2}+ 1/2mv

^{2}.

Why isn't mg(change in)h = 1/2Iw

^{2}+ 1/2mv

^{2}?

Am I missing some term?