Chapter 9 Physics Vocabulary

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9 Terms

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impulse

the product of the average net force on an object and the time interval over which the force acts.

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momentum

the product of the object's mass and the object's velocity; measured in kg times m/s.

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impulse-momentum theory (theorem)

states that the impulse on an object equals the object's final momentum minus the object's initial momentum.

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closed system

a system that does not gain or lose mass.

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isolated system

a closed system on which the net external force is zero.

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law of conservation of momentum

states that the momentum of any closed, isolated system does not change.

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inelastic collisions

objects stick together in collision.

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elastic collisions

when the energy between two objects repel from each other.

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explosions

an object breaking into many pieces.