Moments and centre of gravity Quiz
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5 questions, one answer each
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1. A force of 25 N acts at right angles to a door handle 0.80 m from the hinge. What is its moment about the hinge?
- A. 3.2 N m
- B. 31 N m
- C. 20 N m
- D. 200 N m
2. Which statement defines the centre of gravity?
- A. The point where the mass is greatest
- B. The point through which the whole weight of a body can be considered to act
- C. The geometric centre of every body
- D. The point where a body is supported
3. A uniform plank of weight 200 N is pivoted at its centre. A 300 N weight is 0.40 m from the pivot. At what distance on the other side must a 600 N weight be placed to balance it?
- A. 0.10 m
- B. 0.80 m
- C. 0.60 m
- D. 0.20 m
4. A rod of length 0.50 m has a force of 40 N acting on its end at 30° to the rod. What is the moment about the other end?
- A. 20 N m
- B. 17 N m
- C. 10 N m
- D. 40 N m
5. A beam rests on two supports and a load is moved along it until the beam is about to tip about one support. What is true at that moment?
- A. The force at the other support is zero
- B. The forces at both supports are equal
- C. The beam has no weight
- D. The moment about the first support is zero because the load is at the pivot