What does physics have to do with seat belts? What does a desk toy imply about crashes? Discover the unshakable connection between physics and the effects of car crashes with Understanding Car Crashes – It's Basic Physics. Learn how inertia, momentum, and impulse are all key to designing safe cars – and how physics concepts prove we should always wear safety belts. Includes student and teacher handouts of class discussions and activities in PDF plus 12 video segments of vehicle crash tests.