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one surface or object rubbing against another 9. friction can stop object in motion 10. friction can kill because when going in high speed friction can rip inches of meat off limbs

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gravity is a force that each mass has

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to increase in speed

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velocity is the speed that a thing go

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speed is to move quickly

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Net force is all the force add up together. 2. you calculate net force when they go in opposite way you subtract 3. in same direction you add them up