A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position, the tension in the string is
Correct answer: C. Equal to the weight of the stone
- A. maximum
- B. zero
- C. Equal to the weight of the stone
- D. less than the weight of the stone
Explanation
At the highest point in the vertical circle, the tension in the string must provide the centripetal force needed to keep the stone in circular motion. This tension is equal to the weight of the stone
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About Newton's Laws of Motion
Newton’s laws explain inertia, the relation between net force and acceleration, and action-reaction pairs. Questions involve free-body diagrams, balanced and unbalanced forces, F = ma, force as the rate of change of momentum, and identifying genuine third-law pairs, which act on different bodies.
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