Action-Reaction Cart
Purpose
A heavy pendulum suspended on a wheeled cart demonstrates Newton's Third Law: push the cart and the pendulum swings opposite, or swing the pendulum and the cart rolls opposite. Makes action-reaction pairs and momentum conservation directly observable.
Figure 1:
Action-reaction cart: a heavy aluminum cylinder suspended by wires from an orange metal frame on wheels. Push the cart or swing the pendulum to show Newton's Third Law.