Factors affecting the friction between two solid objects

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, and 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 narrow channels along their perimeter, and these channels are connected with 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.

You can download Science online application on Google Play from this link: Science online Apps on Google Play

The friction between the solid objects and the air

Advantage and disadvantage of friction and the ways to decrease friction

The factors affecting the friction between the solid objects and the water

Accompanied forces to motion, Forces of inertia, Friction forces and Biological forces