There are how many types of …

the question has been answered as per class 8

the 4th friction is Fluid friction

Friction is defined as the force that opposes the motion of a solid object over another. 

Friction is of 3 types

1)Static friction

2)Sliding friction

3)Rolling friction

Static friction

The maximum fictional force present between any two objects when one object just tends to move or slip over the surface of the other object ,is called static friction.Static friction is a kind of starting fiction because an object just tends to start moving, it does not actually move.

Sliding friction

The frictional force present when one object moves slowly or slides over the surface of another object is known as sliding friction

Rolling friction

When an object rolls over the surface of another object ,the resistance to its motion is called rolling friction.

It is always easier to roll than to slide an object over another object.So rolling friction is much less than the sliding friction.