A LevelPhysicsCambridge (CIE)Exam Questions4. Forces, Density & PressureTurning Effects of Forces

Turning Effects of Forces (Cambridge (CIE) A Level Physics): Exam Questions

Exam code: 9702

2 hours22 questions

Select a download format for Turning Effects of Forces

Scroll for more

Select an answer set to view for
Turning Effects of Forces

Easy
Medium
Hard
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

Choose your answer

2
Sme Calculator1 mark

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

    Choose your answer

    3
    Sme Calculator    1 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

      Choose your answer

      4
      Sme Calculator      1 mark

      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

      Choose your answer

      5
      Sme Calculator      1 mark

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

      q9_moments_aqa-as-physics-mcq

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

      • 0.38 N m

      • 0.50 N m

      • 0.76 N m

      • 1.0 N m

      Choose your answer

      1
      Sme Calculator      1 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?

      • 0.2 N m

      • 0.9 N m

      • 1.0 N m

      • 1.7 N m

      Choose your answer

      2
      Sme Calculator      1 mark

      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?

      • 0.3 N m

      • 0.5 N m

      • 0.9 N m

      • 1.0 N m

      Choose your answer

      3
      Sme Calculator      1 mark

      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

      Choose your answer

      4
      Sme Calculator      1 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

      5
      Sme Calculator      1 mark

      A car wheel nut can be loosened by applying a force of 310 N to 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 needed for the mechanic to loosen the nut?

      • 0.2 space straight m

      • 0.3 space straight m

      • 3.0 space straight m

      • 6.0 space straight m

      Choose your answer

      1
      Sme Calculator      1 mark

      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 L over 4 to the right of its original position.

      cie-ial-images192png

      When viewing the shaded face, what is the magnitude of the torque required to stop the cube from toppling?

      • fraction numerator W L over denominator 2 end fraction anticlockwise

      • fraction numerator W L over denominator 2 end fraction clockwise

      • fraction numerator W L over denominator 4 end fraction anticlockwise

      • fraction numerator W L over denominator 4 end fraction clockwise

      Choose your answer

      2
      Sme Calculator      1 mark

      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

      Choose your answer

      3
      Sme Calculator      1 mark

      A mass of 5 kg is attached to the end of a 1 m long uniform beam of mass 2 kg. The beam is fixed to a wall at one end and supported by a wire at an angle of 30° to the beam, 0.7 m from the wall. The beam is in equilibrium.

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

      What is the tension T in the wire?

      • 17 N

      • 84 N

      • 140 N

      • 170 N

      Choose your answer

      4
      Sme Calculator      1 mark

      A horizontal beam of length L and weight W over 2 is suspended from the ceiling by two ropes.

      One rope is attached at the left end of the beam, and the other is attached at a distance fraction numerator 2 L over denominator 3 end fraction from the left end. A load of weight W is suspended from the beam at a distance d from the left end, as shown. The beam is in equilibrium.

      A beam suspended from a ceiling, with a weight marked "W" at distance "d" from left, total beam length "L", and 2L/3 between two vertical wires.

      What value of d ensures that the tension is equal in both ropes?

      • L over 8

      • L over 4

      • L over 3

      • L over 2

      Choose your answer

      5
      Sme Calculator      1 mark

      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. When the string is pulled back, the tension in the bowstring is 10 N.

      cie-4-1-mcq-hard-q3

      What force will accelerate the arrow in the direction of point A when the string is released?

      • 5.2 N

      • 5.8 N

      • 8.6 N

      • 10.3 N

      Choose your answer