FearOfPhysics.com: Two Pendulums, One Heavy, and One Light

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Two Pendulums, One Heavy, and One Light

A pendulum is simply something heavy tied onto the end of a long string. It can swing freely from side to side. There are some particuliarities about just how a pendulum swings though.

Take a look at the situation below. Two pendulums have been hung, each on strings about the same length. One has a big heavy mass on the end of it, the other has a small light mass on the end of it. They are pulled back about the same amount, as shown. When they are released, they will swing to the left. The question is: which one will return to its starting point first? The heavy one? The light one? Or will they return at the same time?

What do you think? Which one will return to its starting point first?

The heavy one.
The light one.
They'll both return at the same time.

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