Question

Which would be the best example to demonstrate the principle of conservation of energy?
Responses
A a stone is crusheda stone is crushed
B light bends around a sharp edgelight bends around a sharp edge
C a pendulum swings back and fortha pendulum swings back and forth
D a balloon inflates when air is blown into ita balloon inflates when air is blown into it

Answer 1

C — a pendulum swings back and forth.

Explanation: As it swings, gravitational potential energy converts to kinetic energy and back. Neglecting friction and air resistance, the total mechanical energy remains constant, so the pendulum is the classic demonstration of conservation of energy.