Inertia Apparatus, Known as ball and card mass force demonstrator, Each

Details

0.75 in. (1.9cm) ball rests on top of a small cardboard square which rests on an aluminum postSpring is positioned alongside the postWhen the spring is released, it shoots the square out from under the ball and the ball falls into a recess on top of the postBall appears to remain at rest on top of the post as if nothing has movedSize: 3 × 3 × 4 in. (7.6 × 7.6 × 10.2cm); weight: 0.22 lb. (0.1kg)