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matter in motion
| Term | Definition |
|---|---|
| motion | an object’s change in position relative to a reference point |
| speed | the distance traveled divided by the time interval during which the motion occurred |
| velocity | the speed of an object in a particular direction |
| acceleration | the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change |
| force | an action exerted on a body in order to change the body's state of rest or motion; force has magnitude and direction |
| newton | the SI unit for force; the force that will increase the speed of a 1 kg mass by 1 m/s each second that the force is applied (symbol, N) |
| net force | a single force whose external effects on a rigid body are the same as the effects of several actual forces acting on the body |
| friction | a force that opposes motion between two surfaces that are in contact |
| gravity | a force of attraction between objects that is due to their masses and that decreases as the distance between the objects increases |
| weight | a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe |
| mass | a measure of the amount of matter in an object; a fundamental property of an object that is not affected by the forces that act on the object, such as the gravitational force |
| inertia | the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object |
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20ccourtwright
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