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physics
| Term | Definition |
|---|---|
| Force | a push or a pull that can change the motion of an object |
| balanced force | separate forces on an object that combined do not change the movement of the object |
| unbalanced force | forces on an object that cause change in the motion of the object |
| net force | the sum of all the forces acting on an object |
| at rest | the state of an object when it is not in motion |
| motion | the change in an object's position with respect to time and in comparison to the position of other objects used as reference points |
| speed | the rate of change of the position with respect to time |
| direction | a straight path that can move along |
| friction | a force that opposes the motion of one surface across another |
| frame of reference | a system that uses axes or background objects to measure the position or movement of an object |
| velocity | measurement of speed and direction of an object |
| acceleration | the rate of change in an object's speed |