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Friction force and Velocity

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nlmitchell97 | 13:47 Thu 26th Mar 2009 | Science
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How does the direction of a friction force compare with the velocity of a sliding object?
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Friction always opposes the direction of movement.
Imagine a skater on ice.

As they slide along (imaging just gliding, legs still), friction between the skates and ice is pushing in the opposite direction to their velocity (the direction they're travelling in), so that eventually the skater will stop.
Friction doesn't depend on velocity, it depends on the coefficient of friction between the bodies and the reaction force (weight) of the moving body. Thus friction is a constant force between two bodies, it is only when a second force is applied to move the body that the effect of friction in reducing the resultant force and acceleration is seen.

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