Friction drives the wheels to go on the road, so car can be moved. If wheels are trapped in the mud or sand, they can not go.

车轮一定要走在有摩擦力的路面上，这样车子才能行动。若车轮落入泥浆沙坑之中，那就动弹不得矣。

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These low speed vehicles are very close to each other, shuttling, going around or backing a car may cause friction or collision, especially at night.

这些低速行驶的车辆与其它车辆非常接近，在停车场穿行、掉头或倒车时碰撞和拖挂的事故时有发生，在夜间时则更显突出。

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After turning off the jet and rocket he will deploy an air brake at 800mph, parachutes at 600mph and finally put his foot on a car-type friction brake at 250mph any faster and the brakes could explode.

ECONOMIST: The land-speed record

By registering the amount of friction between the tyre and the road, the system warns the car's computer-control equipment if the car is in danger of aquaplaning on a large puddle or skidding on ice.

ECONOMIST: MONITOR