Pendulum question!!?

Question

If a pendulum is made to swing in water, compare the time taken for this pendulum to come to a complete stop with the time taken by a pendulum swinging in air. explain the difference?

I want a clear and deep explanation to compare the 2..

Pls help thanks!

Answer 1

When the pendulum is swinging in air the forces acting on it are

1. Force of gravity (acting downwards)

2. Resistance to travel in air ( alacting along path of motion

TheKinetic energy is converted to Potential energy during course of motion. KE> Max at lowest point    PE> MAx at higest point.

Now whn in water the only diffrence is due to the frriction / resistance of water to motion of Pendulum.

The time taken will (friction due to water) times (friction in air)

Answer 2

Force of buoyancy and friction due to water causes measured period in water to increase in water