Useful for demonstrating the momentum changes of varying mass with a visual measure of force. The simple car is equipped with a spring loaded plunger and sliding scale that gets displaced on impact against an obstacle, the displacement being directly related to the quantum of impact created by collision of the car against any stationary surface. The displacement scale remains in displaced position until it is reset and provides direct reading, which is measure of the force itself. Masses can be added to the car to increase the inertia of the mass and car system for further exploration in collisions.