| A | B |
| friction | a force that opposes motion between two surfaces. The amount of friction depends on the type of surface. |
| gravitational energy | is due to an object's position above the ground. |
| kinetic energy | is a form of energy that moving objects possess. |
| light energy | It involves the electro-magnetic spectrum. |
| mechanical energy | is the total amount of kinetic and potential energy. |
| potential energy | is stored energy. |
| Sound Energy | is a form of energy that is detected by the ear. |
| Thermal energy | the same as heat energy |
| Heat | is a form of energy arising from the motion of particles. |