Crash! Launch! Slam! Crash testing is fun and a great way to learn physics. Impact Jack is the only crash test dummy that comes with an electronic sensor that measures the force of the crash. Crash Test Lab's cool customizable Crash Cart comes with a removable roll cage, two types of bumpers, and a safety harness. The activity book demonstrates how Newton's Laws of Motion relate to car crashes (and more importantly, to car safety) and provides ideas for hours of crash test experimentation.