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| the unit used to measure force |
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| the combination of all the forces on an object |
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| the force that two surfaces exert on each other when they rub against each other |
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| occurs when two solid surfaces slide over each other |
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| acts between objects that are not moving |
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| occurs when a solid object moves through a fluid |
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| when an object rolls across a surface |
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| a force that pulls objects towards each other |
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| a measure of the amount of matter in an object |
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| a measure of the force of gravity on an object |
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| resistance to a change in motion |
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| a characteristic of a moving object that is related to the mass and the velocity of the object |
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| law of conservation of momentum |
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| states that in the absence of outside forces, the total momentum of objects that interact do not change |
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| when the only force acting on an object is gravity |
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| objects that orbit around other objects in space |
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| a force that causes an object to move in a circular path |
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