# Ch 8: Basics of Newton's Third Law

### About This Chapter

## Basics of Newton's Third Law - Chapter Summary

This convenient online physics chapter breaks down the basics of Newton's third law of motion. After defining the law, our expert instructors show you its applications in the study of physics and detail the concepts of force pairs, action forces and reaction forces. You'll also take short self-assessment quizzes to practice solving physics problems that involve Newton's third law. You can study the chapter at any time using your computer or mobile device. If you get stuck or need any extra help, simply submit your questions to our instructors. By the end of the chapter, you'll be able to:

- Explain Newton's third law of motion
- Recognize examples of action and reaction forces
- Identify action and reaction force pairs
- Solve problems by applying Newton's third law

### 1. Newton's Third Law of Motion: Examples of the Relationship Between Two Forces

This lesson describes Newton's third law of motion. Examples are provided to illustrate how interacting objects experience forces. The lesson explains how objects accelerate as a result of force. Applications of Newton's third law are illustrated in nature, machines, and space.

### 2. Action and Reaction Forces: Law & Examples

Action force is force acting in one direction. Reaction force is force acting in the opposite direction. Learn more about Newton's Third Law as it explains action and reaction forces through several examples, and test your knowledge with quiz questions.

### 3. Identifying Action and Reaction Force Pairs

Good things often come in pairs, and forces are no exception. In this lesson you'll explore Newton's second and third laws of motion to understand how action and reaction pairs affect objects interacting with each other.

### 4. Practice Applying Newton's Third Law

This lesson will introduce the reader to Newton's Third Law and give real world examples. We'll also look at example problems that show how we can use Newton's Third Law and other equations to solve for unknown forces.

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### Other Chapters

Other chapters within the Physics 101: Intro to Physics course

- Intro to Physics
- Overview of Vectors
- Overview of Kinematics
- Overview of Forces
- Overview of Gravity
- Basics of Newton's First Law
- Basics of Newton's Second Law
- Energy and Work in Physics
- Overview of Linear Momentum in Physics
- Basics of Rotational Motion
- Waves in Physics
- Sound & Light in Physics
- Basics of Optics
- Fluid Dynamics in Physics
- Basics of Thermodynamics in Physics
- Overview of Electrostatics
- Overview of Magnetism
- Basics of Nuclear Physics
- Studying for Physics 101