Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Torsional pendulum
Simple pendulum
Compound pendulum
Second's pendulum

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Theory of Machine
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

Become equal to 2R
Become equal to R/4
Remain same as before
Become equal to R/2

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