- #1

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## Homework Statement

## Homework Equations

Rotational Kinetic Energy = 1/2*I*w^2

## The Attempt at a Solution

I was just wondering if someone explain to me why the potential energy is MgL/2 ?

Is this not the same for the torque from gravity?

- Thread starter AROD
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- #1

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Rotational Kinetic Energy = 1/2*I*w^2

I was just wondering if someone explain to me why the potential energy is MgL/2 ?

Is this not the same for the torque from gravity?

- #2

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- #3

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Because the rod's center of mass is placed at L/2 over the ground.

Edit: oops, already answered :)

Edit: oops, already answered :)

- #4

Doc Al

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The rod is uniform. Where is its center of mass?I was just wondering if someone explain to me why the potential energy is MgL/2 ?

The torque from gravity about the pivot point depends upon the angle of the rod.Is this not the same for the torque from gravity?

- #5

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then as it tips the hypotoneuse would be L/2, and the height would be this times the cos of theta.

thanks

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