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Answer» Supporting FRICTION: 1) Cycling - the friction between the tires and the road are necessary for the bike to function 2) Running - the friction between the athlete's feet and the ground surface is necessary otherwise the runner would fall over 3) Swimming - the friction in the water is required for the swimmer to be propelled forward
Opposing friction 1) Swimming - the friction makes it more difficult for the swimmer to swim very fast 2) Bobsleigh - the aim is to go as fast as possible but the friction between the bottom of the sleigh and the ice SLOWS it down 3) Diving - the friction between the diver and the water creates wasted Kinetic energy and sound energy whereas the aim is to be as streamlined as possible
hope it HELPS you
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