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# Chapter 2: Motion in a Straight Line

Difficulty Level: At Grade Created by: CK-12

Credit: Courtesy of NASA
Source: http://commons.wikimedia.org/wiki/File:STS-30_launch.jpg

Everything moves. People, objects, planets, and even galaxies are constantly moving. Physics gives us ways to explain motion using not only words, but also equations and graphs. This chapter explores the physics explanations of motion, called “kinematics,” and including position, speed, velocity, and acceleration. By the end of this chapter, you will understand kinematics in one dimension.

## Chapter Outline

### Chapter Summary

The first thing physics is used to describe is motion. Motion is described through position, displacement, distance, speed, velocity, and acceleration. Kinematics equations give the relationship between these descriptions; the three equations given in this chapter can be used, assuming constant acceleration, to determine the relationship between an object's displacement, velocity, and acceleration.

1. [1]^ Credit: Courtesy of NASA; Source: http://commons.wikimedia.org/wiki/File:STS-30_launch.jpg; License: CC BY-NC 3.0

Oct 11, 2013