In the case of a circular arc cam with a flat-faced reciprocating follower, when the follower is in contact with nose of cam, the external spring force required for maintaining the contact between follower and cam is
1
Greater than the force due to gravity of mass of the follower
2
Greater than the inertia force of the follower
3
Smaller than the inertia force of the follower
4
Greater than the weight of the follower