Question

1-Are there any conservative forces that do not do any work on the block during the...

1-Are there any conservative forces that do not do any work on the block during the period of time when pendulum (block and tubing) is swinging upward? Explain


2- Are there external-conservative forces, beside air resistance, that do work on the ball/pendulum system? explain



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Answer #1

1) there is conservative force that do not do any work on the block during swinging upward.

the only force acting in this case is weight(gravitational force) which is a conservative force that is changing the kinetic energy to potential energy.so no work done by gravitational force.

2) Thera are no external conservative forces that do work on ball pendulum system.The pendulum only gets stopped by air resistance which is non-conservative force.Other tahn this no external conservative force is acting on the Bob.

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