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Lesson: Conservation of Energy

The conservation of energy principle states that the sum of the kinetic and potential energies remains constant during motion. In this lesson, you will learn how to apply this principle to solve problems on moving bodies.

Worksheet: Conservation of Energy • 21 Questions

Q1:

A body of mass 20 kg fell from a height of 42.3 m above the surface of the ground. Find the sum of its kinetic energy and its potential energy relative to the ground 2 seconds after it started falling. Take .

Q2:

A body of mass 7 kg fell vertically from point to the ground. Given that, when it reached the ground, its kinetic energy was 3 724 joules, find its gravitational potential energy relative to the ground when it was at point . Consider the acceleration due to gravity to be 9.8 m/s².

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