caption: Uses of Friction On Earth, friction is very helpful When you ride a bicycle, the friction between the road and the bicycle slows the bike down Air resistance, a type of friction, slows down a parachute Without friction, you would not be able to slow down once in motion Your own two feet keep you from slipping and falling on the ground because of friction Sometimes friction is not helpful For example, metals parts in a car's engine are always touching Too much friction between the metal parts wears them out and overheats the engine In a vacuum, there is no air resistance That is why all objects fall at the same speed in outer space
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