Lesson: Conservation of Energy Mathematics

In this lesson, we will learn how to apply the conservation of energy principle to solve problems on moving bodies.

Lesson Plan

Students will be able to

recall and understand the conservation of energy principle and how it can be applied to solve problems,
solve problems about moving bodies using the conservation of energy principle where no work is done by a resistive force,
solve problems about moving bodies using the conservation of energy principle where friction needs to be accounted for.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Worksheet

Q1:

True or False: The change in kinetic energy + the change in potential energy = the work done.

Q2:

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 .

Q3:

A body of mass 9 kg fell vertically from a point 3.4 m above the ground. At a certain moment, the speed of the body was 3.9 m/s. Determine the change in the body’s gravitational potential energy from this point until it reached a point 68 cm above the ground. Take .