Mechanical Engineering - Engineering Mechanics - Discussion

Thanks all.

When the body is in motion the friction is called dynamic friction and when the body is in rest the friction is called static friction.

Why not it should be a rolling friction?

Please explain me.

The friction experienced by a body in motion is known as dynamic friction. The body enters into motion when the force acting on it is greater than the limiting friction.

Dynamic friction is the type of friction that now exists between the contact surfaces. The limiting static friction is always less than the dynamic friction.

When the body is in motion that friction is called dynamic friction and when the body is at rest that friction is called static friction.

Dynamic friction also known as kinetic friction when the body starts moving, the friction opposing the motion is defined as dynamic friction
Static friction is when the body doesn't move when a small force is applied.
Limiting friction is the maximum value of static friction just before the body starts moving.
Rolling friction is when the body starts to resist motion when it rolls over the surface.