Introduction Did you know that playground swings can provide a good lesson in physics—as well as lots of fun? The back-and-forth motion of a swing is an example of a pendulum. We see pendulums ...

What would happen, Schrödinger asked, to a cat trapped in a closed box ... s lab. For all its technical complexity, the experiment mimics a very simple phenomenon: the motion of a pendulum.

The apparent danger of having one's head smashed gives the demonstration great crowd appeal. Assemble the stand for the pendulum mount using the lab stands, clamps, and rod. Tie the mass to the rod.