| A | B |
|---|
| action | force that balances a reaction force |
| force | push or pull |
| unbalanced | a force that causes motion or a change in motion |
| acceleration | changing velocity |
| velocity | rate of motion |
| air resistance | frictional force from air molecules hitting an object as it moves through the air |
| friction | force between surfaces that goes against the motion of an object |
| mass | amount of matter of an object |
| motion | movement a change in position |
| direction | line along which something is pointing, facing or moving |
| average speed | rate an object could travel between two points without changin speed |
| distance | length of a path an object travels |
| speed | rate of motion |
| action force | one of a pair of forces that causes a change of motion of an object |
| balanced forces | force on an object equal in strength and opposite in direction that cancel each other. |
| gravity | force that exists between any two objects because the objects have mass |
| laws of motion | Newtons 3 laws that describe the behavior of objects in terms of masses,forces and motion |
| 1st laws of motion | objecvt will stay at rest or continue to move in the same direction at the same speed, unless an outside force acts on it |
| 2nd laws of motion | an object accelerates when an outside force acts on it. |
| 3rd law of motion | all forces occur in pairs, for every action force there is a reaction force of equal strength but opposite in direction. |
