Moments and equilibrium Quiz
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5 questions, one answer each
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1. A force of 30 N acts at right angles to a door handle 0.80 m from the hinge. What is the moment about the hinge?
- A. 24 N m
- B. 0.027 N m
- C. 38 N m
- D. 240 N m
2. A uniform metre rule is balanced on a pivot at its centre. A 3.0 N weight hangs 20 cm from the pivot on one side. What weight must hang 30 cm from the pivot on the other side?
- A. 4.5 N
- B. 3.0 N
- C. 2.0 N
- D. 1.0 N
3. Which statement is correct for a body in equilibrium?
- A. Only the forces must balance
- B. Only the moments must balance
- C. The resultant force and the resultant moment are both zero
- D. The clockwise moments are zero
4. What is the moment of a 20 N force acting at 30° to a 0.50 m rod, about the end of the rod where it is pivoted?
- A. 10 N m
- B. 5.0 N m
- C. 8.7 N m
- D. 20 N m
5. A uniform plank of weight 200 N rests on supports at its ends. A 600 N child stands exactly at the midpoint. What is the force at each support?
- A. 400 N
- B. 100 N
- C. 300 N
- D. 800 N