GCE O-Level · Physics (6091)

Moments: Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Moments.

9 questions18 marksFree, no account

Question 1

1 mark

How can the stability of a stool be significantly increased?

Question 2

1 mark

An object is in equilibrium under the action of several forces. Which of the following conditions must be met for the object to have no resultant turning effect?

Question 3

1 mark

The diagram shows a uniform plank of length \(4.0\text{ m}\) and weight \(100\text{ N}\) supported by a pivot at its left end and a vertical rope at its right end. A man weighing \(600\text{ N}\) stands on the plank at a distance of \(1.0\text{ m}\) from the pivot.
Calculate the tension in the rope.

Question 4

1 mark

Which of the following modifications would most effectively increase the stability of a tall cabinet?

Question 5

1 mark

A force \(F\) is applied to a wrench to loosen a bolt, as shown in the diagram. Which labeled distance represents the perpendicular distance required to calculate the moment of force \(F\) about the center of the bolt?

Question 6

2 marks

Calculate the moment of a force of \(25\text{ N}\) applied to a lever at a perpendicular distance of \(0.40\text{ m}\) from the pivot.

Write your answer out first, then check it against the worked solution.

Question 7

3 marks

A force of \(10\text{ N}\) is applied to the handle of a door at an angle. If the perpendicular distance from the hinge to the line of action of this force is \(0.75\text{ m}\), calculate the resulting moment.

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Question 8

5 marks

A uniform beam of weight \(60\text{ N}\) and length \(4.0\text{ m}\) is pivoted at its left end. It is held in a horizontal position by a cable attached to its right end. The cable makes an angle of \(30^\circ\) with the beam. Calculate the tension in the cable.

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Question 9

3 marks

A uniform lever of length \( 1.6\text{ m} \) is balanced horizontally at its centre on a pivot. A load of \( 40\text{ N} \) is placed at the far left end of the lever, as shown in the diagram.

(a) Calculate the moment produced by the \( 40\text{ N} \) load about the pivot. State the unit in your answer.
(b) An upward vertical force \( F \) is applied at the far right end of the lever to keep the lever in horizontal equilibrium. Calculate the magnitude of force \( F \).
(c) Explain why the weight of the uniform lever itself does not create a moment about the pivot.

Write your answer out first, then check it against the worked solution.

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