| A | B |
| energy | the ability to cause change or do work |
| kinetic energy | the energy of motion |
| joules | SI unit of energy |
| potential energy | stored energy |
| elastic potential energy | energy stored by something that can stretch or compress |
| chemical potential energy | energy stored in chemical bonds |
| gravitational potential energy | energy of position, the higher the object the greater the potential energy |
| mechanical energy | the total amount of potential and kinetic energy in a system |
| law of conservation of energy | energy cannot be created or destroyed |