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| When an object changes position over time relative to a reference point. |
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| The distance traveled divided by the time interval during which the motion occurred |
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| The speed of an object in a particular direction |
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| The rate at which velocity changes over time; an object accelerates if its speed, direction, or both change. |
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| a push or a pull exerted on an object in order to change the motion of the object; force has size and direction. |
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| the SI unit for force (symbol, N) |
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| the combinations of all the forces acting on an object. |
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| a force that opposes motion between two surfaces that are in contact. |
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| friction between moving surfaces |
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| When a force is applied to an object but the object does not move |
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| a force of attraction between objects that is due to their masses |
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Term
| Law of Universal Gravitation |
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Definition
| All objects in the universe attract each other through gravitational force.
The size of the force depends on the masses of the objects and the distance between the objects. |
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Definition
| a measure of the gravitional force exerted on an object; its value can change with the location of the object in the universe. |
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| a measure of the amount of matter in an object |
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