Chapter 7: laws of motion and momentum

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7 Terms

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force–time graph

A graph of net force against time

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impulse

The area under a force–time graph — the product of force and the time for which the force acts

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inelastic collision

A collision in which kinetic energy is lost

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linear momentum

A property of an object travelling in a straight line

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Newton’s second law of motion

The rate of change of momentum of an object is directly proportional to the resultant force and takes place in the direction of the force

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perfectly elastic collision

A collision in which no kinetic energy is lost

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principle of conservation of momentum

Total momentum of a system remains the same before and after a collision