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 .
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 .