ASPhysicsCIETopic Questions4. Forces, Density & Pressure4.1 Turning Effects of Forces

Syllabus Edition

First teaching 2023

First exams 2025

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Turning Effects of Forces (CIE AS Physics)

Topic Questions

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1
Sme Calculator1 mark

What is the centre of gravity 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

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2
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The diagram shows four forces applied to a circular object.

cie-ial-images153png

Which of the following describes the resultant force and resultant torque on the object?

 

Resultant force

Resultant torque

A

B

C

D

non-zero

non-zero

zero

zero

non-zero

zero

non-zero

zero

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3
Sme Calculator1 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?

cie-ial-physics-mcq-4-1-q7

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4
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Two parallel forces, each of magnitude F, act on a body as shown

cie-ial-physics-mcq-4-1-q9

What is the magnitude of the torque on the body produced by this couple?

  • Fd

  • Fs

  • 2 Fd

  • 2Fs

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5
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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

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1
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The diagram shows a solid cube with weight W and sides of length L. It is supported by a frictionless spindle that passes through the centres of two opposite vertical faces. One of these faces is shaded.

cie-ial-images191png

The spindle is now removed and replaced at a distance  begin mathsize 11px style L over 4 end style    to the right of its original position.

cie-ial-images192png

When viewing the shaded face, what is the torque of the couple that will now be needed to stop the cube from toppling?

  •   fraction numerator W L over denominator 2 end fraction anticlockwise

  • begin mathsize 12px style fraction numerator W L over denominator 2 end fraction end style   clockwise

  • fraction numerator W L over denominator 4 end fraction   anticlockwise

  •  begin mathsize 12px style fraction numerator W L over denominator 4 end fraction end style  clockwise

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2
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A trailer of weight 30 kN is attached to a truck. The trailer is raised until it is held at 50˚ to the horizontal by a vertical force F as shown in the diagram.

The trailer is 2.7 m in length and the position of its centre of gravity G is a third of the length from the hinge at O.

cie-ial-images202png

What is the vertical force F applied to the end of the trailer?

  • 10 kN

  • 15 kN

  • 30 kN

  • 60 kN

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3
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A 1 m long uniform beam has a mass of 2 kg and has a further mass of 5 kg attached at the end. It is in contact with a wall on one side and is supported by a wire at an angle of 30° to the beam. The beam is in equilibrium. What is the tension, T, in the wire?

cie-4-1-mcq-hard-q1-1

  • 17.14 N

  • 84 N

  • 140 N

  • 168 N

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4
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A beam of length L and weight w  is suspended from the ceiling by two ropes. One rope is attached at the leftmost point of the beam, the second at a distance of 2 m along the beam. A weight W is suspended from the beam at a distance d from one end of the beam. Which formula expresses the value of d that must be used to ensure that the tension in both ropes is equal?

cie-4-1-mcq-hard-q2

  •  space d space equals space fraction numerator W space plus space w space minus space begin display style 1 half end style w L over denominator W space end fraction

  • d space equals space fraction numerator W space plus space w space minus fraction numerator space 1 over denominator space 2 end fraction w L over denominator 2 W space end fraction space

  • d space equals space fraction numerator 2 W space plus space 2 w space minus space w L over denominator W space end fraction

  • d space equals space W left parenthesis 1 plus w over W right parenthesis space

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5
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The diagram shows a bow and arrow. The arrow is positioned at the centre, X, of the string of the bow stretched between points Y and Z. The string is pulled back such that the tension in the bowstring is 10 N. What force will accelerate the arrow in the direction of point A, when the string is released?

cie-4-1-mcq-hard-q3

  • 5.15 N

  • 5.75 N

  • 8.58 N

  • 10.3 N

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1
Sme Calculator1 mark

A 20 cm ruler is pivoted at its centre. Equal and opposite forces of magnitude 5.0 N are applied to the ends of the ruler, creating a couple as shown

cie-ial-physics-mcq-4-1-q16-diagram-1

What is the magnitude of the torque of the couple on the ruler when it is in the position shown?

  • 0.17 N m

  • 0.87 N m

  • 1.0 N m

  • 1.7 N m

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2
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A 10 cm beam is pivoted at its centre. Equal and opposite forces of 10 N pull the ends of the beam, creating a couple as shown.

cie-4-1-mcq-med-q1-1

What magnitude is the torque of the couple?

  • 0.25 N m

  • 0.5 N m

  • 0.87 N m

  • 1 N m

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3
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A 1 m long uniform beam is hung from the ceiling by a rope. and is balanced when a 20 g mass is positioned 30 cm from the rope as shown. 

cie-4-1-mcq-med-q2

What is the mass of the metre rule?

  • 0.06 g

  • 20 g

  • 60 g

  • 100 g

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4
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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

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5
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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?

  •  l space equals space fraction numerator 650 over denominator open parentheses 310 space cross times space 0.7 close parentheses end fraction space equals space 0.17 space straight m

  • l space equals space fraction numerator open parentheses 310 space cross times space 0.7 close parentheses over denominator 650 end fraction space equals space 0.33 space straight m

  •  l space equals space fraction numerator open parentheses 310 space cross times space 0.7 close parentheses over denominator open parentheses 2 space cross times space 650 close parentheses end fraction space equals space 3.00 space straight m

  •  l space equals space fraction numerator open parentheses 2 space cross times space 650 close parentheses over denominator open parentheses 310 space cross times space 0.7 close parentheses end fraction space equals space 6.00 space straight m

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