Question

For a simple pendulum bob, which of the following energies increase as it approaches the equilibrium position?

• A. Potential energy
• B. Kinetic energy
• C. Mechanical energy
• D. Electrical energy

Answer 1

The correct option is B

Kinetic energy

The kinetic energy of the pendulum bob increases as the bob approaches the equilibrium position and the kinetic energy decreases as the bob moves further away from the equilibrium position.

When the pendulum is in its extreme position, its potential energy is maximum and its kinetic energy is zero, as it is at its maximum height and has no velocity. As the bob reaches its equlibrium position, its velocity increases and its height decreases. Hence, its kinetic energy increases whereas its potential energy decreases.