The impact car is equipped with a spring scale and slide that is displaced on impact against a wall or similar obstacle. The slide remains in its displaced position until reset. The student rolls the car down the ramp, and measures the impact. Next, additional mass is added to the recessed cavity inside the car and the experiment is repeated. The student can take direct readings from the scale to measure the increasing force. Instructions provided. (7″ x 3″ x 2″; .375lb).