Beakman explains collisions and how all of the energy from the collision needs to go somewhere. The energy is either transferred to the other object, to heat, or to noise. They explain elastic vs. inelastic collisions using a game show skit.
Beakman challenge: Bounce a tennis ball 15 feet in the air. He puts it on top of a basketball and drops them. It takes more energy to get the basketball to bounce off the ground because it's heavier. This energy is transferred to the tennis ball and it goes flying in the air.
Bill Nye explains that heat is energy and can be used to do work, such as keep up warm, run an engine, or affect other molecules. Using real-world examples, he then describes the three ways that heat can move from one place to another: conduction, convection, and radiation.