Chapter 9 Motion & Chapter 10(I) Force & Gravity
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20 terms
Terms | Definitions |
|---|---|
 Motion | when an object's distance from another one is changing |
| Velocity | speed in a given direction |
| Acceleration | rate at which speed or velocity changes. Speeding up, slowing down, changing direction |
| Reference Point | a place/object used for comparison to determine if something is in motion |
| Constant Speed | when the speed of an object does not change |
| Force | a push or a pull |
| Weight | the force of gravity acting on an object or person |
| Mass | total amount of matter that make up an object or person |
| Friction | force that one surface exerts on another when they rub against each other |
| Rolling Friction | when one surface rolls over another |
| Fluid Friction | when an object moves through liquid or gas |
| Free Fall | when gravity is the only force acting on an object |
| Air Resistance | a type of friction where air acts against gravity |
| Law of Universal Gravitation | when two objects in the universe attract each other |
| Gravity | the force that pulls falling objects toward Earth |
| Speed | distance / time |
| Acceleration | final speed - initial speed / time |
| Average Speed | total distance / total time |
| m/s2 | example of a unit of acceleration |
| m/s | example of a unit of speed |
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