1N30.50 Happy/Unhappy Pendulum and Cart

Swinging the pendulum so that the “happy” (elastic) side hits the cart launches it faster than when the “unhappy” (inelastic) side hits the cart.Or knock over, or not, a 2X4 block

A small black rubber ball fixed in a thin longitudinal frame serves as the bob of a bifilar pendulum. The ball is positioned above a smooth aluminum track. A cart on the track is placed to be struck by the swinging pendulum at the bottom of its arc. The cart is free to glide in the direction of the pendulum's swing.

A small black rubber ball fixed in a thin longitudinal frame serves as the bob of a bifilar pendulum. The pendulum's strings are fixed to a wooden rod. A small wooden block is set on end, positioned to be struck by the pendulum bob at the bottom of its arc. A small wooden L-bracket on the table behind the pendulum serves two purposes: the edge of the bottom marks the point where the wooden block should rest, and the edge of the back marks the pendulum's release point.

Location: A4 (track), B4-3 (cart), C2-4 (happy/unhappy pendulum)