Question

Energy can neither be created nor destroyed, but it can be converted into one another. It is called _______-
1. Law of perpetual energy
2. Law of conservation of energy
3. Law of entropy
4. Law of conservation of mass

Answer 1

Correct Answer - Option 2 : Law of conservation of energy

The correct answer is Law of conservation of energy.

• Energy can neither be created nor destroyed, but it can be converted into one another. It is called the Law of conservation of energy.
• The law of conservation of energy states that “In a closed system, i.e., a system that is isolated from its surroundings, the total energy of the system is conserved.”

•  Example of the law of conservation of Energy:

Action	Change in energy
A ball tossed up in the air	Chemical energy from your muscles → kinetic energy of the ball.
A skier slides down a hill	the gravitational potential energy of the skier → kinetic energy of the skier + thermal energy of the snow and skies (from friction).
A compressed spring launches a ball in a pinball game	The elastic potential energy of the spring → kinetic energy of the ball.
As the pendulum swings down	the gravitational potential energy of the pendulum → kinetic energy of the pendulum.