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forces & motion
| Term | Definition |
|---|---|
| reference point | the starting point you choose to describe the location or position of an object |
| position | an object distance and direction from a reference point |
| motion | is the process of changing position |
| displacement | is the different between the initial or starting position and the final position |
| speed | is a measure of distance an object travels in a given amount of time |
| velocity | is the speed and direction of a moving object |
| vector | is a quantity that has both magnitude and direction |
| Acceleration | is a measure of the change in velocity |
| force | is a push or pull on an object |
| contact force | is a push or pull on an object by another object that is touching it |
| newton's 2nd law | the acceleration of an object equals the net force on the object divided by the objects mass |
| friction | is a force that resists the sliding motion of two surfaces that are touching |
| free body diagram | is a simple model to understand systems of objects with any amount of applied force |
| net force | is the sum of all the forces acting on an object |
| newton's first law | on object in motion will stay in motion and an object at rest will stay at rest unless acted on by a force |
| inertia | an objects ability to resist any change in motion |
| newton's 3rd law | for every action (force) in nature there is an equal and opposite reaction |
| force pair | the forces two objects apply to each other |
| normal force | the force that pushes perpendicular to the objects surface |
| elastic collision | when colliding objects bounce off each other |
| inelastic collision | when colliding objects stick to each other |
| no contact force | a force that one object can apply to another object without touching |
| gravity | an attractive force that exists between all objects that have mass |
| field | a region of space that has a physical quanitity at every point |
| weight | the gravitaion force on an object |