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Friction is all around us
Look at the photographs and explain in each case where friction comes into play. Say whether the frictional forces are a nuisance or useful. The first one is done for you as an example.
Rock climbing
Friction between:a) the hands of the rock climber and the rope: usefulb) the shoes of the rock climber and the rock face: useful
Pushing a car Motorcycle racing
Athletes racing Pushing a supermarket trolley
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Answers to questions:Rock climbingFriction between :
a) The hands of the rock climber and the rope – useful.b) The shoes of the rock climber and the rock face – useful.
Pushing a carFriction between
a) The feet of the people pushing against the ground – useful.b) The car tyres and the surface they are in contact with – nuisance.
Motorcycle racingFriction between :
a) The motorcycle seat and the motorcyclist – useful.b) The tyres and the road – useful.c) The air and the machine and its rider – nuisance.
AthletesFriction between :a) The feet and the track surface – useful.b) Air and the runners – nuisance.
Pushing a supermarket trolleyFriction between :
a) The trolley wheels and the floor – nuisance.b) The feet of the person pushing the trolley and the floor – useful.c) The hands and the trolley handle - useful.