Revision NotesExam QuestionsPast Papers
ASPhysicsAQAExam QuestionsMechanics & MaterialsMoments

Moments (AQA AS Physics): Exam Questions

Exam code: 7407

3 hours43 questions

Select a download format for Moments

Scroll for more

Select an answer set to view for
Moments

Easy
Medium
Hard
11 mark

What are the units of the moment of a force?

  • N m–1

  • N m

  • N s

  • N kg–1

Choose your answer

21 mark

Which of the statements about the required conditions for equilibrium is correct?

  1. The sum of the clockwise moments about a point equals the sum of the anticlockwise moments about the same point

  2. There is no resultant force

  • 1

  • 2

  • 1 & 2

  • neither

Choose your answer

31 mark

What is the centre of mass of an object?

  • the geometrical centre of the object

  • the point about which the total torque is zero

  • the point at which the weight of the object may be considered to act

  • the point through which gravity acts

Choose your answer

41 mark

The diagram below shows a beam in equilibrium.

q4_moments_aqa-as-physics-mcq

Which statement about the force at X is correct?

  • It is smaller than 100 N

  • It is also 100 N

  • It is larger than 100 N

  • Not enough information to know

Choose your answer

51 mark

The beam in the diagram below is in equilibrium by the three forces, X, 10.1 and 3.2 N.

q5_moments_aqa-as-physics-mcq

What is the value of the force X?

  • 2.9 N

  • 3.2 N

  • 6.9 N

  • 13.3 N

Choose your answer

61 mark

A pair of scissors requires 10 N of force on each handle in order to close the blades. 

q6_moments_aqa-as-physics-mcq

What force is applied by the scissor blades in the diagram below to cause the blades to come closer together?

  • 10 N

  • 20 N

  • 40 N

  • 100 N

Choose your answer

71 mark

Two co-planar forces act on the rim of a wheel. The forces are equal in magnitude.

Which arrangement of forces provides only a couple?

q7_moments_aqa-as-physics-mcq

    Choose your answer

    81 mark

    Which of the following statements about the pair of forces on a couple is correct?

     

    Magnitude

    Direction

    Parallel or Perpendicular

    A

    Equal in magnitude

    Opposite in direction

    Parallel to the distance between them

    B

    Equal in magnitude

    Opposite in direction

    Perpendicular to the distance between them

    C

    Opposite in magnitude

    Equal in direction

    Parallel to the distance between them

    D

    Equal in magnitude

    Equal in direction

    Perpendicular to the distance between them

      Choose your answer

      91 mark

      A steering wheel of diameter 0.38 m is rotated to the left by two forces of 2 N, as show in the diagram.

      q9_moments_aqa-as-physics-mcq

      What is the moment of the couple produced by the rotation of the steering wheel?

      • 0.38 N

      • 0.50 N

      • 0.76 N

      • 1.0 N

      Choose your answer

      101 mark

      A bird of mass 15 g sits on a uniform rod of mass 0.5 kg suspended from vertical wires with tension T1  and T2. T1 is 3 N and T2 is 2 N.

      q10_moments_aqa-as-physics-mcq

      What is the total clockwise moment about point P?

      • 0.053 Nm

      • 1.0 Nm

      • 1.2 Nm

      • 1.3 Nm

      Choose your answer

      11 mark

      A force of 9.8 N is applied at one end of a uniform beam of mass 2 kg that balances in equilibrium.

      q11_moments_aqa-as-physics-mcq

      Which of the following corresponds to the correct value of the reaction R on the beam?

      • 9.8 N down

      • 9.8 N up

      • 26 N down

      • 26 N up

      Choose your answer

      21 mark

      A load L of 5000 N is placed on a horizontal beam between two boxes A and B. The beam itself exerts a force of 10 kN at its centre of mass.

      The two reaction forces from the boxes are R1 and R2.

      q12_moments_aqa-as-physics-mcq

      Which of the following corresponds to the correct value of R1?

      • 900 N

      • 6000 N

      • 9000 N

      • 16 500 N

      Choose your answer

      31 mark

      The uniform bar of length 0.60 m has a weight of 12 N and is in equilibrium in the diagram below. There is a hinge on the far right of the bar.

      q13_moments_aqa-as-physics-mcq

      What is the reading on the Newtonmeter?

      • 7 N

      • 9 N

      • 15 N

      • 96 N

      Choose your answer

      41 mark

      The wall hook shown has a weight of 50 N attached to the end.

      q14_moments_aqa-as-physics-mcq

      What is the moment on the point of attachment to the base?

      • 1 N m

      • 1.25 N m

      • 2.5 N m

      • 5 N m

      Choose your answer

      51 mark

      A door handle in the diagram below has a length 10 cm requires a force of 20 N to turn it.

      q15_moments_aqa-as-physics-mcq

      If the handle breaks and the door must be opened using the axle of the handle, with a diameter of 0.5 cm, how much force is needed?

      • 4 N

      • 8 N

      • 40 N

      • 400 N

      Choose your answer

      61 mark

      A load L is placed on a horizontal beam balanced by boxes A and B. The beam has a mass mg.

      q16_moments_aqa-as-physics-mcq

      If load L is moved from box A towards box B, which of the following statements is true?

      • R1 increases and R2 decreases

      • R1 decreases and R2 increases

      • R1 = R2 throughout

      • Cannot tell without further data

      Choose your answer

      71 mark

      A car bonnet, represented by QP, of mass 12 kg is pivoted at P. Its weight acts at G where QG = GP = 2.0 m.

      q17_moments_aqa-as-physics-mcq

      What force, F, acting perpendicular to QP as shown, is required to hold the bonnet at 40° to the horizontal?

      • 45 N

      • 59 N

      • 21 N

      • 120 N

      Choose your answer

      81 mark

      A car wheel nut can be loosened by applying a force of 310 N on the end of a bar of length 0.7 m as in X. A car mechanic is capable of applying forces of 650 N simultaneously in opposite directions on the ends of a wheel wrench as in Y.

      q18_moments_aqa-as-physics-mcq

      What is the minimum length l of the wrench which would be needed for him to loosen the nut?

      • 0.17 m

      • 0.33 m

      • 3.00 m

      • 6.00 m

      Choose your answer

      91 mark

      The diagram shows a uniform beam of weight 2.5 N and length of 150 cm is pivoted 32 cm from one end for use as a simple balance.

      q19_moments_aqa-as-physics-mcq

      A rock is placed at the end of the beam. The beam moves to a steady horizontal position when a weight of 7.1 N is added at a distance of 80 cm from the pivot as shown.

      What is the weight of the rock?

      • 0.042 N

      • 18 N

      • 21 N

      • 24 N

      Choose your answer

      101 mark

      An object, made from two equal masses joined by a light rod, falls with uniform speed through air. The rod remains horizontal.

      Which statement about this system is incorrect?

      • it is in equilibrium because it is falling steadily

      • it is in equilibrium because the masses are equal

      • it is in equilibrium because it is the clockwise and anticlockwise moments are equal

      • it is in equilibrium because it has a resultant force

      Choose your answer

      11 mark

      The diagram shows a uniform shelf along the axis XY with a mass 0.5 kg. A 3 kg load is placed at Y and a wire of tension T holds the shelf to the wall.

      q21_moments_aqa-as-physics-mcq

      What is the magnitude of the tension in the supporting wire?

      • 0.898 N

      • 10.4 N

      • 102 N

      • 280 N

      Choose your answer

      21 mark

      The wedge shown in the diagram below is suspended in equilibrium by a cable at an angle of 120º to the longest part.

      The wedge has a mass of 200 kg, with a centre of mass ¾ of the length of AB from the hinge at A. AB is 2 m long and BC is 1.2 m high.

      q22_moments_aqa-as-physics-mcq

      What is the tension on the cable?

      • 2900 N

      • 1700 N

      • 990 N

      • 1500 N

      Choose your answer

      31 mark

      The medieval war machine shown below launches a stone projectile when the cable is released.

      q23_moments_aqa-as-physics-mcq

      What is the tension T in the cable in the position shown?

      • 2600 N

      • 3100 N

      • 3700 N

      • 800 N

      Choose your answer

      41 mark

      The diagram below represents the arm of a crane lifting a 100 kN load. The arm has a mass of 8000 kg and a machine produces a reaction force F of 5 m from the bottom of the arm. The crane arm is uniform and in equilibrium.

      q24_moments_aqa-as-physics-mcq

      What is the value of F?

      • 54 MN

      • 52 MN

      • 2.9 kN 

      • 2.9 MN

      Choose your answer

      51 mark

      The diagram below shows an irregular object supported on two springs. The spring on the left has a spring constant of k1 and a load of 20 N acts 0.50 m from this spring and 0.25 m from the spring on the right.

      When the object is placed on the bottom of the springs, they each extend by the same amount.

      q25_moments_aqa-as-physics-mcq

      If the object is to be horizontal, what is the value of the spring constant for the spring on the right?

      • 0.5 k1

      • 5 k1

      • 2 k1

      • k1

      Choose your answer

      61 mark

      A car is driving up a uniform beam, of length 12 m. The car has a mass of 1000 kg and the beam has a mass of 200 kg. 

      q27_moments_aqa-as-physics-mcq

      How far along the beam beyond the pivot point can the car go just before the beam topples?

      • 0.4 m

      • 0.6 m

      • 0.8 m

      • 1.0 m

      Choose your answer

      71 mark

      The diagram shows a child’s balancing game.

      q28_moments_aqa-as-physics-mcq

      The wooden rod is uniform and all the rings are of equal mass. Two rings are hung on peg 14, one on peg 2 and one on peg 11.

      On which hook must a fourth ring be hung in order to balance the rod?

      • 2

      • 7

      • 5

      • 4

      Choose your answer

      81 mark

      A uniform rod with a rubber handle and wooden section is made to balance on a pivot as shown below.

      q29_moments_aqa-as-physics-mcq

      What is the ratio fraction numerator d e n s i t y blank o f blank r u b b e r over denominator d e n s i t y blank o f blank w o o d end fraction ?

      • 3.1

      • 5.9

      • 6.1

      • 9.6

      Choose your answer

      91 mark

      The diagram below four tangential forces applies to a circular object with radius r.

      q30_moments_aqa-as-physics-mcq

      If the clockwise direction is taken as positive, what is the resultant moment acting on the object?

      • 64 r clockwise

      • 0 stationary

      • 12 r clockwise

      • 12 r anticlockwise

      Choose your answer