| A | B |
|---|
| force | a push or a pull that causes an object to move, stop or change direction |
| potential energy | the energy an object has because of its condition or position |
| acceleration | the rate of increase in speed |
| deceleration | the rate of decrease in speed |
| kinetic energy | the energy of motion |
| weightlessness | a condition in which an object feels no forces |
| speed | the distance an object moves in a certain period of time |
| motion | any change in the position of an object |
| friction | a force that opposes motion |
| weight | the force between the earth and an object |
| centripetal force | a force pulling or pushing an object toward the center of its curved path |
| gravity | the force of attraction between all bodies in the universe |
| inertia | the tendency of matter to remain at rest or in a uniform straight line |
| jerk | rate of change in acceleration |
| air resistance | the force of air pushing against a moving object |
