do the friction always supports the motion
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Friction does not always opposes motion. For eg when a car is accelerating forward , the tyres push against the road in backward direction. Friction pushes itself in forward and car also pushes forward. Thus friction and motion are in same direction.
Similarly when a runner accelerates forward the shoe pushes backward, friction pushes forward and runner pushes forward. Thus both are in same direction
Hence force of friction does not always opposes motion or the tendency of motion.
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No it stops the motion and slows everything down. People say that on smooth surfaces there is less friction but my floor tiles are smooth then also i dont slip
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