| Term | Definition |
|---|
| reference point | a place or object used for comparision to determine if something is in motion. An object is in motion if ti changes position relative to a reference point. |
| meter | A unit used to measure length |
| speed | distance/time |
| average speed | total distance/total time |
| Instantanious speed | the rate at which an object is moving at a given instant in time |
| velocity | When you know both the speed and direction of an object's motion, you know the _____ of an object |
| slope | the steepness of a line on a graph |
| acceleration | change in speed/time (measured m/s2) |
| friction | the force that two surfaces exert on each other when they rub against each other. The strength of the force of friction depends on two factors how hard the surfaces push together and the types of surfaces involved. |
| gravity | a force that pulls objects towards one another |
| mass | the amount of matter in an object |
| momentum | a characteristic of a moving object that is related to the mass and velocity of the object. |
| momentum formula | mass*velocity=____kg*m/s |
| law of conservation of momentum | the toal momentum of any group of objects remains the same, or is conserved unless outside forces act upon the objects. |
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