1. Heat and Energy

6. The internal motion of the particles in a body is its kinetic energy. Because these particles are vibrating back and forth they have a potential energy as well. The sum of the PE and KE of the particles is called the thermal energy of the object. Remember that the kinetic theory says that a hot body has more thermal energy than a cold body. The hot body has a higher total sum of PE and KE than a cold body.

17. Which way does heat flow?

18. When does heat stop flowing?