Page 32 - Science Course 2 (Book 2)

Newton’s Third Law of Motion Mo8-L4a: What is Newton’s Third Law of

Lesson 4 Motion?

Let’s Begin

In this topic, you will learn the following
lessons:
Mo.8–L4a: What is Newton’s Third Law of Opposite Forces
Motion? When an object applies a force on another object,
Mo.8–L4b: What is the Law of Conservation of the second object applies a force of the same
Momentum? strength on the f rst object, but the force is in the
opposite direction.
What is Newton’s Third Law of
Mo8-L4a Motion?

KEY CONCEPTS:
1. What is Newton’s Third law of motion?
2. Why don’t the forces in a force pair cancel each
other out?

Vocabulary A-Z
Let us learn some vocabulary

Newton’s Third Law of Motion
law that states that for every action there is an equal
and opposite reaction. Newton’s Third Law of Motion

According to Newton’s third law of motion, when
one object applies a force on a second object, the
second object applies an equal force in the opposite
direction on the f rst object.

force pair
the forces two objects apply to each other.

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