| A | B |
|---|
| acceleration | a change in speed or direction |
| elapsed time | the amount of time that passes from one event to another |
| energy | the ability to do work |
| generator | converts or changes mechanical energy inot electrical energy |
| gravity | the force of attraction between any two objects that have mass |
| kinetic energy | the energy of motion |
| law of conservation of energy | energy cannot be created or destroyed |
| law of universal gravitation | gravitational force depends on the mass of the two objects and the distance between them |
| motion | a change of position |
| potential energy | stored energy or energy of position |
| speed | the rate at which the position of an object changes |
