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a measure of the amount of matter in an object

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its value can change with the location of the object in the universe.

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a measure of the gravitational force exerted on an object.

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a force of attraction between objects that is due to their masses.

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Without friction when you walk you would just slip and fall cause their is not friction.

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-Friction can put holes in your pants and sock

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Not Moving

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when force is applied and an object doesn't

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Substances that are applied to surfaces to reduce friction between the surfaces.

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not moving

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Moving

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Ice

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Rougher surfaces have more microscopic hills and valleys than smoother surfaces do.

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Friction can cause a moving object to slow down and eventually stop.

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A force that opposes motion between two surfaces that are in contact.