types of friction are
static friction
rolling friction
sliding friction
fluid friction
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Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases.
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The force of static friction , start subscript, s, end subscript is a force between two surfaces that prevents those surfaces from sliding or slipping across each other. This is the same force that allows you to accelerate forward when you run. Your planted foot can grip the ground and push backward, which causes the ground to push forward on your foot. We call this "grippy" type of friction, where the surfaces are prevented from slipping across each other, a static frictional force.
When an object rolls over the surface, it experiences resistance to its motion. This resistive force is a type of kinetic friction and known as rolling friction. The point at which the object is in contact with the surface is critical in understanding rolling friction.
Sliding friction force opposes the movement between two contact surfaces that slide against each other. This force depends on the type of contact surfaces (materials and finishing level) and on the load applied in the direction perpendicular to the motion direction (Normal force).
Those substances which are able to flow easily are called Fluids. Water and air are the most common fluids. There is a friction whenever an object moves through a fluid. It is called fluid friction. Air is very light and thin, yet it exerts frictional force on objects moving through it. When an object moves through the air, it pushes the air out of the way and air pushes back on the object. This push of air on the moving object creates fiction which tends to slow down the moving object. Air exerts frictional force on cars, buses, aeroplanes, rockets and birds moving through it.
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