The factors affecting the friction between two solid objects

The friction between two solid objects

The friction arises when two solid objects touch each other , When the friction force is larger than the movement force , the body does not move , when the friction force is smaller than the movement force , the body moves , The direction of the friction force is opposite to the direction of the movement .

The friction force

The rough surfaces increase the friction force .

What are the factors affecting the friction between two solid objects ?

The friction between two solid objects increases by increasing the speed and the  surface area of the moving body , The friction between the solid objects increases between the rough surfaces .

The rubber tires

The water on the roads reduces the friction between the road and the car tires , So the drivers can not control the vehicle ( the wheels ) , The car tires press the water under them and the water is squeezed out , when the car moves slowly on the wet roads .

When the car moves so fast , there is no time for the car tires to squeeze the water out , and the water is trapped under them , so the drivers can not control the car as the friction is reduced .

The water should be prevented from staying between the car tires and the road , So , the rubber tires are designed with the  narrow channels along their perimeter , And these channels are connected with the curved grooves to squeeze the water out  .

You must replace the car tires  , when their grooves disappear as the grooves are necessary to squeeze the water out , where the water reduces the friction , and makes the control of the car very hard .

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2 Responses

  1. michael massawe says:

    Nice answer

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