They provide friction, so the vehicle can grip the road, but some of the power supplied to the tyres is lost as heat.

汽车的抓地力正是因为轮胎的摩擦力提供的。但供给轮胎的能量一部分要消耗在生成的热量。

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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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Based on the tire magic formula model, the dynamic variation process of the tire optimal slip ratio and the maximum friction coefficient on the road with the vehicle velocity is researched.

基于轮胎的魔术公式模型，研究了轮胎在路面的最佳滑移率和最大摩擦系数随汽车速度的动态变化过程。

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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