This booklet is an introduction to the video analysis of motion using the free software ImageJ. All you need is a computer and a video file. You will see step-by-step instructions on how to download and install the video analysis software. You will also see how to install the add-ons for importing videos from cell phones. ImageJ can be used to analyze motion which was recorded in common video files. You will learn how to take position measurement data from a video as well as how to determine the velocity, acceleration, and occurring forces. Using these techniques, you will be able to analyze the physics of motion. In the last chapter, I suggest a few experiments and tasks you can do using the video analysis.