Moments, couples and centre of mass Quiz
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5 questions, one answer each
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1. A force of 15 N acts at a perpendicular distance of 0.40 m from a pivot. What is its moment about the pivot?
- A. 6.0 N m
- B. 38 N m
- C. 0.027 N m
- D. 15 N m
2. A couple consists of two forces of 5.0 N whose lines of action are 0.20 m apart. What is the moment of the couple?
- A. 0 N m
- B. 0.50 N m
- C. 1.0 N m
- D. 2.0 N m
3. A uniform metre rule of weight 1.2 N is pivoted at the 40 cm mark. A weight W hung at the 10 cm mark balances it. What is W?
- A. 0.12 N
- B. 0.30 N
- C. 0.36 N
- D. 0.40 N
4. Where is the centre of mass of a uniform rectangular block?
- A. At the middle of its top face
- B. At the centre of the block
- C. At one corner
- D. At the middle of its base
5. A uniform 4.0 m plank of weight 80 N is supported at each end. A 120 N load is placed 1.0 m from the left end. What is the force at the right-hand support?
- A. 70 N
- B. 100 N
- C. 130 N
- D. 140 N