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Physics · Forces and Newton’s Laws of Motion

Introduction

CC BY 4.0 · OpenStax · approximately 1 min read

Learning objectives

View original figure (external; image not reproduced in this text edition)

Original figure description: A dolphin is jumping out of water in a curved path over the water.

Newton’s laws of motion describe the motion of the dolphin’s path. (Credit: Jin Jang)

Teacher Support

Before students begin this chapter, they may wish to review the concepts of distance, displacement, speed, velocity, acceleration, scalars, vectors, representing vectors, units of acceleration, and acceleration due to gravity. Explain that an object that is not moving is often described in physics as being at rest.

Teacher Support

Point out that we come across motion in our everyday lives; for instance, a dolphin jumping out of water as shown in the photo. There are simple laws of physics that govern motion. These laws are universal; that is, they apply to every object in the universe. Much of the work done in describing motion was done by Sir Isaac Newton. This chapter is about motion, the causes of motion, and the universal laws of motion.

Isaac Newton (1642–1727) was a natural philosopher; a great thinker who combined science and philosophy to try to explain the workings of nature on Earth and in the universe. His laws of motion were just one part of the monumental work that has made him legendary. The development of Newton’s laws marks the transition from the Renaissance period of history to the modern era. This transition was characterized by a revolutionary change in the way people thought about the physical universe. Drawing upon earlier work by scientists Galileo Galilei and Johannes Kepler, Newton’s laws of motion allowed motion on Earth and in space to be predicted mathematically. In this chapter you will learn about force as well as Newton’s first, second, and third laws of motion.

← Representing Acceleration with Equations and GraphsForce →

Attribution. Physics, OpenStax, Rice University, and the contributing authors credited in the book. Licensed under Creative Commons Attribution 4.0 International. Source revision 56e71824e7 of openstax/osbooks-physics (2026-10-13). CC BY 4.0. Original source ↗. Text edition of a pinned CC BY 4.0 source revision of the OpenStax book, converted from CNXML by the EvidenceHelix importer. Original prose, learning objectives, tables, exercises, glossary and captions are preserved; images are not copied (figures link to the original source and keep their credits). No new content was added. Later revisions of this book can carry different licence terms and are not used.

In this chapter Contents

  • Introduction
  • Force
  • Newton's First Law of Motion: Inertia
  • Newton's Second Law of Motion
  • Newton's Third Law of Motion

Source

OpenStax source file ↗

Illustrated original ↗

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