| Term | Definition |
|---|
| acceleration | the rate at which velocity changes with time |
| Average speed | the overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time |
| Balanced force | equal forces acting on an object in opposite directions |
| displacement | distance and direction of an object's change in position from the starting point |
| distance | the property created by the space between two objects or points |
| force | a push or pull on an object |
| inertia | (physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force |
| instantaneous speed | the rate of motion at a given instant in time, such as that given on a car's speedometer |
| net force | the combination of all forces acting on an object |
| speed | distance travelled per unit time |
| velocity | the speed of an object in a particular direction |
| air resistance | frictional force air exerts on a moving object; acts opposite in direction to the object's motion |
| centripetal acceleration | the acceleration toward the center that holds a satellite in elliptical orbit |
| centripetal force | the inward force on a body moving in a curved path around another body, the force that causes an object moving along a circular path to move toward the center of the path |
| friction | the force that opposes the motion of one surface as it moves across another surface |
| momentum | the product of a body's mass and its velocity |
| Newtons 2nd law of motion | the net force of an object equals its mass times its acceleration |
| Newtons 3rd law of motion | a principle that states that for every action there is an equal reaction in the opposite direction |
| sliding friction | friction that occurs when one solid surface slides over another |
| static friction | friction that acts on objects that are not moving |
| weight | the vertical force exerted by a mass as a result of gravity |
| Newtons 1st law of motion | An object at rest/motion will remain at rest/motion until acted upon by an outside force |
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