Centre of Mass Quiz
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5 questions, one answer each
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1. What is the centre of mass of an object?
- A. A. The lowest point of the object
- B. B. The point at which the object's mass may be thought to be concentrated
- C. C. The point where all forces cancel to zero
- D. D. The geometric centre of any shape
2. An irregular lamina is suspended freely and allowed to settle. Where is its centre of mass relative to the suspension point?
- A. A. Directly above it
- B. B. Directly below it
- C. C. At the same height, to one side
- D. D. It cannot be determined
3. To find the centre of mass of an irregular lamina practically, how many suspension points are needed at minimum?
- A. A. One
- B. B. Two
- C. C. Four
- D. D. It cannot be found practically
4. Where does the centre of mass of a perfectly symmetrical object lie?
- A. A. Outside the object
- B. B. At its heaviest edge
- C. C. Along its axis of symmetry
- D. D. It has no fixed centre of mass
5. A designer wants to make a floor lamp harder to knock over. Which change to its centre of mass and base would best improve stability?
- A. A. Raise the centre of mass and narrow the base
- B. B. Lower the centre of mass and widen the base
- C. C. Raise the centre of mass and widen the base
- D. D. Centre of mass and base width make no difference