What does the term jump signifies in cam and follower?

Follower looses contact with cam surface when follower rotates beyond a particular speed due to gravitational forces.

Follower looses contact with cam surface when follower rotates beyond a particular speed due to inertial forces.

Follower gain contact with cam surface when cam rotates beyond a particular speed due to gravitational forces.

Follower looses contact with cam surface when cam rotates beyond a particular speed due to inertial forces.