Study for Vocab. test on Monday (Nov.8)

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speed

the distance traveled divided by the time

(s=d/t)

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average speed

the total distance traveled divided by the total time taken

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instantaneous speed

the speed of an object at one moment in time

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acceleration

change in velocity divided by time taken for the change to take place

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positive acceleration

speed up

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negative acceleration

slow down

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velocity

speed and direction of a moving object

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inertia

tendency of an object to resist a change in it's motion

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momentum

a measure of how hard it is to stop a moving object; dependent on it's mass and velocity

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law of conservation of momentum

the total momentum of objects that collide with each other is the same before and after the collision

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collision

when two or more objects hit each other

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motion

a change in position

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relative motion

a change in position of one object compared to the position of another

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distance

how far an object moves

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displacement

the distance and direction an object moves relative to it's starting point