Mousetrap cars are fun to build and race.  they are an easy way to start learning about how simple toy cars work, designing and building and problem solving.  Mousetrap cars make a great 4-H project and in New Hampshire members can race their cars in a distance challenge at both County and State 4-H Activities Day.  This simple guide will help anyone get started in building mousetrap cars.  It uses cardboard for the car body, CD's and rubber washers for wheels, a mousetrap, some wooden dowels and some string.