A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to____________?
Correct answer: D. To keep the centre of gravity always vertically above the rope
- A. Prop him up if he falls
- B. Spread out his weight and reduce the pressure on the rope
- C. Add extra weight to keep the rope tightly stretched
- D. To keep the centre of gravity always vertically above the rope
Explanation
The pole helps the walker maintain balance by lowering the combined centre of gravity and increasing rotational inertia. This makes it easier to keep the centre of gravity vertically above the rope.
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