If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is________________?
Correct answer: B. At the lowest point
- A. At the highest point
- B. At the lowest point
- C. At any point during motion
- D. At the point where gravity is not acting
Explanation
At the lowest point of a vertical circle, the stone has its greatest speed because it has lost the most gravitational potential energy. The string tension must then provide the centripetal force as well as support the weight, so it is greatest there and the string is most likely to break. Students may choose the highest point because the stone is farthest from the centre, but its speed and required tension are smaller there.
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