why friction opposes motion
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Friction always acts in the oppositedirection to movement, i.e. it opposes the motion of an object. Air resistance is a frictional force which opposes motion through air. Frictional forces can be useful, e.g. to allow car tyres to grip the road or to slow down a falling parachutist.
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Friction opposes the motion between THE TWO SURFACES IN CONTACT (the motion that would have happened if there was no friction). You can walk because the friction pushes the sole of your shoe forward. If there was no friction, the sole of the shoe would move backward (the direction you are kicking the Earth).
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