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Forces and motion
| Term | Definition |
|---|---|
| Displacement | the difference between the initial ,or starting position and final position. |
| Speed | a measure of the distance an object travels in the given amount of time |
| velocity | speed and direction of a moving object |
| vector | a quantity that has both magnitude and direction |
| reference point | the starting point |
| position | an object distance and direction from reference point |
| motion | the progress of changed position |
| acceleration | a measuring of the change in velocity during changes during a period of time |
| force | a push or a pull on an object |
| contact force | is a push or a pull on one object by another object that is touching |
| newtons 2nd law | an acceleration of an object equals the net force on the object |
| friction | a contact force that resists sliding motion of two surfaces that are touching . |
| free body diagram | a simple model to understand what will happen to an object |
| net force | the combination of all the forces acting on an object |
| newtons first law | a object at rest stays at rest and an object in motion stays in motion unless a force acts up on it. |
| non contact force | a force that one object can apply to another object without touching it. |
| gravity | is an attractive force that exist between all objects that have mass. |
| field | a region of space that has a physical quantity (such as force) at every point. |
| weight | gravitational force exerted on a object |
| newtons 3rd law | when an object applies force to another object |
| inertia | the inherent resistance of any physical object to change its state of motion or rest, directly proportional to its mass |
| force pairs | the force two objects apply to eatchothers |
| normal force | the force that pushes perpendicular |
| inelastic collisions | interactions where total system momentum is conserved, but total kinetic energy is not, typically losing energy through deformation, sound, or heat. |
| elastic collisions | a collision where both total kinetic energy and total momentum are conserved |