Moments & Levers Quiz
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5 questions, one answer each
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1. What is the equation for the moment of a force?
- A. A. M = F + d
- B. B. M = F / d
- C. C. M = F x d
- D. D. M = F x d^2
2. What does the principle of moments state for a balanced object?
- A. A. All forces on it are equal
- B. B. Total clockwise moment equals total anticlockwise moment about any pivot
- C. C. Its centre of mass is at the pivot
- D. D. The object cannot topple under any circumstances
3. A seesaw is balanced with a 30 N weight 2 m from the pivot on one side. A 20 N weight is placed on the other side. How far from the pivot must it be to balance?
- A. A. 1 m
- B. B. 1.5 m
- C. C. 3 m
- D. D. 4 m
4. A tall cupboard is tilted until the line of action of its weight passes outside its base. What happens?
- A. A. It remains balanced regardless
- B. B. It topples over
- C. C. Its weight decreases
- D. D. Its centre of mass moves back inside the base automatically
5. A crowbar is used to lift a heavy rock with a small applied force at the far end. What principle explains why this works?
- A. A. The lever reduces the rock's weight
- B. B. The lever acts as a force multiplier, since the effort is applied further from the pivot than the load
- C. C. The pivot removes the need for any turning force
- D. D. The rock's centre of mass shifts under the crowbar