Centre of Gravity Quiz
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5 questions, one answer each
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1. What is meant by the centre of gravity of an object?
- A. A. The heaviest part of the object
- B. B. The point through which the whole weight of the object may be considered to act
- C. C. The point where the object touches the ground
- D. D. The centre of the object's outline only
2. What piece of equipment is hung alongside an irregular lamina to help find its centre of gravity?
- A. A. A spring balance
- B. B. A set square
- C. C. A plumb line
- D. D. A protractor
3. An object is in equilibrium. What must be true?
- A. A. It has no resultant force but may have a resultant moment
- B. B. It has no resultant moment but may have a resultant force
- C. C. It has both no resultant force and no resultant moment
- D. D. It must be completely motionless forever
4. A beam pivoted at its centre has weights producing anticlockwise moments of 1.6 N m in total from two forces. For the beam to be in equilibrium, what must be true of the clockwise moments?
- A. A. They must total less than 1.6 N m
- B. B. They must total more than 1.6 N m
- C. C. They must total exactly 1.6 N m
- D. D. There must be no clockwise moment
5. A tall, narrow cabinet and a low, wide cabinet are tilted by the same small angle. Which is more likely to topple, and why?
- A. A. The low, wide cabinet, because it has more mass near the ground
- B. B. The tall, narrow cabinet, because its line of action of weight falls outside its base sooner
- C. C. Neither will topple, as tilting never affects stability
- D. D. The tall, narrow cabinet, because it weighs more overall