Page 33 - Science Course 2 (Book 2)

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

Key Concept A force pair is the forces two objects apply to each
other.
What is Newton’s Third Law of Motion?
If the forces of a force pair always act in opposite
What is Newton’s third law of motion? directions and are always the same strength, they do
not cancel each other out because each force acts
on a different object.

Adding forces can only result in a net force of zero if the forces act on the same object.

In a force pair, one force is called the action force and the other force is called the reaction force.

Key Concept SUMMARY
What are Natural Resources?
What is Newton’s Third Law of Motion?
Newton’s third law of motion describes the
Why don’t the forces in a force pair cancel each force pair between two objects.
other?
For every action force, there is a reaction force
that is equal in strength but opposite in
direction.

25