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AP® Physics 1 & 2

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Pendulum Demonstration

APPH12-TPYCMD

A physics teacher performs a demonstration where he pulls a pendulum back to touch his nose, and then releases it from rest to swing freely. He explains that the pendulum will not strike his nose upon returning after a full swing, because it cannot swing higher than the location from which it began.

What principle is this teacher demonstrating?

A

Conservation of Mechanical Energy.

B

Conservation of Kinetic Energy.

C

Conservation of Mass.

D

Conservation of Momentum.