Turning Effect of Forces Quiz
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5 questions, one answer each
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1. Which of the following is the correct equation for calculating the moment of a force?
- A. Moment = Force × perpendicular distance from the pivot
- B. Moment = Force ÷ perpendicular distance from the pivot
- C. Moment = Force + perpendicular distance from the pivot
- D. Moment = Force × parallel distance from the pivot
2. A spanner is used to tighten a bolt. Turning the bolt becomes easier when you use a longer spanner. This is because:
- A. The force required increases
- B. The perpendicular distance from the pivot increases, so the moment increases for the same force
- C. Longer spanners are made of stronger metal
- D. The bolt becomes looser
3. A uniform beam is balanced on a pivot at its centre. A 60 N force acts 1.5 m to the left of the pivot. What force must be applied 2 m to the right of the pivot to keep the beam in equilibrium?
- A. 40 N
- B. 45 N
- C. 60 N
- D. 90 N
4. A student sets up an experiment using a metre rule balanced on a pivot to demonstrate equilibrium. Which condition must be satisfied for the rule to be in equilibrium?
- A. There must be a resultant force but no resultant moment
- B. There must be no resultant force and no resultant moment
- C. There must be no resultant moment but the resultant force can be non-zero
- D. There must be equal forces on both sides of the rule
5. A beam is balanced on a pivot with three forces acting on it: 50 N at 0.8 m left of pivot (downward), 40 N at 0.5 m right of pivot (downward), and an unknown force at 1.2 m left of pivot (downward). For the beam to be in equilibrium, what is the magnitude of the unknown force?
- A. 15 N
- B. 25 N
- C. 35 N
- D. 50 N