| Term | Definition |
| work | Done when a force is used to move an object |
| energy | The ability to do work or cause change |
| force | A push or pull |
| kinetic energy | Energy of motion |
| potential energy | Energy that is stored and ready to use |
| elastic potential energy | The energy of stretched or compressed objects |
| gravitational potential energy | Energy an object has as a result of its position |
| radiant energy | Energy that travels in waves |
| energy conversion | A change of one form of energy to another |
| law of conservation of energy | Energy can change from one form to another but CANNOT be destroyed |
| photosynthesis | The process by which plants use water, plus carbon dioxide and energy from the sun to make food |
| respiration | The process by which glucose is broken down to release energy |
| fuel | A material that releases energy when it burns |
| fossil fuel | An energy-rich substance (coal, oil, natural gas) formed from the remains of organisms |
| combustion | The burning of a fuel |
| power | The rate at which work is done |