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a measure of the amount of matter in an object.

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a measure of the gravitational force

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a force pf attraction between objects that is due to their masses

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substances that are applied to surfaces to reduce friction. ex.) oil, wax, grease

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writing- thats what allows the led to show up on your paper. so you don't fall when you walk

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when you fall and scrap your knee on the ground

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moving

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not moving

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friction can cause a moving object to slow down and eventually stop.
The amount of friction depends on the force pushing two surfaces together.

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a force that opposes motion between 2 things that are in contact

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When the net force isn't 0 N.

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When the forces on an object produce a net force of 0 N, the forces are balanced. Will not cause change in the motion)

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combination of all the forces acting on an object

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the SI unit for force (symbol=N)

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a push or pull to change the motion of an object (all forces have both size and direction)

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The acceleration that occurs in a circular motion (ex. ferris wheel, blades on windmill)

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DECREASE in acceleration

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INCREASE in velocity

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when you combine two velocities that are in the same direction (add them)

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the object that appears to stay in place

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meters per second (m/s)

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the speed of an object in a particular direction (must include a reference point)

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the distance traveled divided by the time interval during which the motion occured

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an object's change in position relative to a reference point

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change in velocity (final speed divided by starting) divided by time

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how fast an object's velocity changes

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total distance divided by total time

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Velocity has direction. Speed doesn't