how many types of frictional forces are there?please state the exact number.
Types of friction are static, limiting, dynamic and rolling friction.
Static friction is the force opposing a push or pull on a body, so that it stays in rest.
Limiting friction is the friction at which a body just begins to move.
Dynamic friction is the opposing force on a body which is in motion.
Rolling friction is the frictional force which helps in a body to acquire rolling motion.
Hope it is clear!