Action-Reaction Pairs (Newton’s Third Law)

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Section 3.15 Action-Reaction Pairs (Newton’s Third Law)

Principle 3.15.1. Action-Reaction Pairs.

Forces come in pairs known as Action-Reaction Pairs. Since all forces arise from an interaction between two different systems, you can always find an Action-Reaction Pair to any force. This idea is sometimes known as Newton’s Third Law of Motion.

Exercises Activities

1.

When a book is sitting at rest on a flat table, there are two forces acting on it. Identify these two forces and explain why they are not Newton’s 3rd Law pairs.

2.

Identify the Newton’s 3rd Law pair for each force acting on the book from the previous question, which is sitting at rest on a flat table.

Learning Introductory Physics with Activities

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Section 3.15 Action-Reaction Pairs (Newton’s Third Law)

Principle 3.15.1. Action-Reaction Pairs.

Exercises Activities

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