When a stone tied to a string is whirled in a circle the work done on it by the string is ........

General Science (Easy) Physics

When a stone tied to a string is whirled in a circle, the work done on it by the string is

positive

negative

zero

undefined

- Option 1: Positive

- Positive work is done when the force has a component in the direction of the displacement.

- Here, the string exerts a centripetal force inward, while the stone moves perpendicular.

- Option 2: Negative

- Negative work occurs when force has a component opposite to the direction of the displacement.

- In this case, again, the force is perpendicular to the stone's path.

- Option 3: Zero

- Work is zero when force is perpendicular to displacement.

- The string exerts an inward force, keeping the stone moving in a circle, perpendicular to the force.

- Correct Answer

- Option 4: Undefined

- Work can be undefined in ambiguous or non-classical systems.

- Here, classical mechanics apply with well-defined forces and paths.

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