Theory of Machine
The example of rolling pair is

Ball bearing and roller bearing
Ball and socket joint
Bolt and nut
Lead screw of a lathe

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Theory of Machine
A governor is said to be stable, if the

Radius of rotation of balls decreases as the equilibrium speed decreases
Radius of rotation of balls increases as the equilibrium speed increases
Radius of rotation of balls increases as the equilibrium speed decreases
Radius of rotation of balls decreases as the equilibrium speed increases

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