Question

For a simple pendulum, a graph is plotted between its kinetic energy (KE) and potential energy (PE) against its displacement d. Which one of the following represents these correctly?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

A simple pendulum performs simple harmonic motion.
For simple harmonic motion.
Potential energy foes as $\frac{1}{2}m{\omega }^2{x}^2$
The maximum potential energy being $\frac{1}{2}m{\omega }^2{A}^2$
Kinetic energy does as $\frac{1}{2}m{\omega }^2(A^2-x^2)$. Graph (b) fits these plots.