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18 Cards in this Set
- Front
- Back
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force
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a push or a pull
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gravity
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the force of attraction the exists between two objects
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newton
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in the metric system the unit used to measure force or weight
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balanced forces
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equal forces acting in opposite directions
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mass
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the amount of matter in an object
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weight
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a measure of the pull of gravity on an object's mass
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net force
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the combination of all the forces action on an object
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relative motion
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the change in position of one object compared to the position of another
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frame of reference
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the object an observer uses to detect motion
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speed
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the distance an object moves in a certain period of time
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instantaneous speed
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the speed at any given point
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speedometer
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a device that shows instantaneous speed
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velocity
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a measure of both the speed and direction of a moving object
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acceleration
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the change in velocity during a particular time period
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inertia
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the tendency of an object to resist any changes in its state of motion
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law
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a statement that describes events or relationships that exist in nature
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friction
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the force between surfaces that resist the movement of one surface past another surface
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air resistance
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the friction from air molecules hitting an object as the object moves through the air
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