Does friction slow moving objects down or speed them up?

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A It depends on the colour of the object
B It speeds them up
C It slows them down
D It depends on how smooth the surface is

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Answer: C. It slows them down

friction always acts in the direction opposite to motion, no matter how rough or smooth the surface is ,
while the texture of the surface may make a difference, friction will always slow down a moving object

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Does friction slow moving objects down or speed them up?

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