Lesson: Newton’s First Law of Motion Mathematics

In this lesson, we will learn how to solve problems using Newton’s first law.

Lesson Plan

Objectives

Students will be able to

recall and state Newton’s first law of motion,
find missing forces acting on a body at rest using Newton’s first law of motion,
solve real-world problems involving a body moving at a constant speed using Newton’s first law of motion.

Exclusions

Students will not cover

Newton’s second law of motion.

Lesson Video

Lesson Explainer

Sample Question Videos

03:10
05:33
02:46

Lesson Worksheet

Q1:

In the given figure, the body is moving with uniform velocity under the action of a system of forces. Given that the forces are measured in newtons, find the magnitudes of and .

Q2:

A car of mass 1.8 metric tons is moving at a constant speed on a horizontal road. If the resistance to the motion is 57.6 kg-wt per tonne of the car’s mass, find the force of its motor.

Q3:

A body was moving uniformly under the effect of three forces , , and . Given that and , where and are orthogonal unit vectors, determine which ensures that it will move at a constant velocity.