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IGCSEPhysicsCambridge (CIE)Exam Questions1. Motion, Forces & EnergyMoments

Moments (Cambridge (CIE) IGCSE Physics): Exam Questions

Exam code: 0625 & 0972

3 hours46 questions

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Moments

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11 mark

Four objects are shown below. Each is acted on by two forces.

Which of the objects is in equilibrium?

q1-easy-mcq-1-5--moments-cie-igcse-physics

    Choose your answer

    21 mark

    Four cuboids are shown in the diagram below. The position of their centre of gravity is also shown.

    q2-easy-mcq-1-5--moments-cie-igcse-physics

    Which of the cuboids is the most stable?

      Choose your answer

      31 mark

      A triangle with uniform density is suspended from a thread. Which diagram shows a system which is not in equilibrium?

      1-5-q3-e-triangle-suspended

        Choose your answer

        41 mark

        A woman is using a screwdriver to prise the lid off a cylindrical tub of paint.

        1-5-4-e-paint-lid

        Which row states how she would increase the moment applied by the greatest amount?

         

        Type of screwdriver

        Force applied

        A

        Wider

        Double 

        B

        Wider

        Half

        C

        Longer 

        Double 

        D

        Longer

        Half

          Choose your answer

          51 mark

          Extended tier only

          In a classroom, a uniform beam with a pivot at its centre has a 15 N weight suspended from one end. An instrument fixed to the ceiling is attached to the same end.

          1-5-5-e-newtonmeter-beam

          What instrument must be used to show that the resultant moment on a system in equilibrium is zero?

          • Joulemeter

          • Force meter

          • Ruler

          • Momentmeter

          Choose your answer

          11 mark

          The diagrams below show three beams, each is pivoted at the centre. Each beam also has two forces acting on it, as shown.

          44qPzZJY_q1-medium-mcq-1-5--moments-cie-igcse-physics

          Which of the beams will rotate clockwise?

          • X, Y and Z

          • X and Y

          • Y and Z

          • None

          Choose your answer

          21 mark

          A ‘yardarm’ is a stick, hung from a string, that is used to weigh goods. Goods are placed in the pan on the left, and weights are added to the box on the right side until it balances. The weight of the pan and the box are such that the weight of the yardarm itself is entirely balanced by the pan. The yardarm is 65 cm long.

          q2-medium-mcq-1-5--moments-cie-igcse-physics

          How many 0.5 N weights need to be added to the box in order to balance the yardarm?

          • 2

          • 3

          • 6

          • 12

          Choose your answer

          31 mark

          A plank rests on two supports, as shown in the diagram. The plank is in equilibrium. Three forces act on the plank.

          q3-medium-mcq-1-5--moments-cie-igcse-physics

          Which statement is true?

          • The upward force is larger than the downward force.

          • The resultant force on the beam is zero and the resultant moment on the beam is zero.

          • The resultant moment on the beam is zero, but the resultant force is not zero.

          • All three forces are equal in size.

          Choose your answer

          41 mark

          A corkscrew is used to open a bottle of wine.

          Two forces are applied at each of the positions shown below.

          q4-medium-mcq-1-5--moments-cie-igcse-physics

          Which pair of forces produces the greatest turning force?

            Choose your answer

            51 mark

            Extended tier only

            The diagram shows a door handle with three forces acting on it.

            auOc2VVM_q5-medium-mcq-1-5--moments-cie-igcse-physics

            How will the door handle move?

            • It will turn clockwise.

            • It will turn anticlockwise.

            • It will move to the left.

            • It will not move at all.

            Choose your answer

            61 mark

            The diagrams each show a beam resting on a pivot and being acted on by some forces. The beam is not attached to the pivot. The pivot is in the centre of the rod in each case.

            TeIiGBaa_q6-medium-mcq-1-5--moments-cie-igcse-physics

            Which of the beams is in equilibrium?

              Choose your answer

              71 mark

              A wardrobe is shown tilted at a variety of angles.

              TuEkUNPR_q7-medium-mcq-1-5--moments-cie-igcse-physics

              In which position is the wardrobe in equilibrium?

                Choose your answer

                81 mark

                Why are passengers not allowed to stand up on the top deck of a double decker bus?  

                • They cannot be trusted to stand where the driver can’t see them.

                • They would raise the pressure exerted by the bus on the road.

                • They would increase the gravitational potential energy of the bus.

                • They would raise the centre of mass of the bus, causing it to become less stable

                Choose your answer

                91 mark

                A beam on a pivot supports a load P at one end and a load Q at the other end. 

                The weight of the beam can be ignored. 

                Diagram of a lever with a central pivot. Block P is 30cm from the pivot, and block Q is 70cm from the pivot, on opposite ends of the lever.

                The beam is balanced.

                Which row gives possible values for P and for Q?

                 

                P/N

                Q/N

                A

                21

                7

                B

                21

                9

                C

                30

                10

                D

                30

                70

                  Choose your answer

                  101 mark

                  A hole is made in a square tile of uniform thickness. The diagram shows the tile hanging loosely on a nail.

                  Where is the centre of gravity of the tile?  

                  Diagram of a tilted square labelled ABCD with a central point D. A nail is shown through a hole at A. The side AC is labelled as tile.

                    Choose your answer

                    111 mark

                    A balloon and a mass are attached to a rod that is pivoted at a fixed point P.

                    Diagram of a horizontal beam marked in centimetres, with a balloon at 30 cm and a mass at 20 cm, with point P at 0 cm on the right.

                    The balloon is filled with helium, which is a gas that is less dense than air. 

                    The balloon filled with helium applies an upward force on the rod.

                    The rod is horizontal and in equilibrium.

                    Which action causes the rod to rotate clockwise?

                    • moving the balloon to the 40 cm mark and the mass to the 30 cm mark

                    • moving the balloon to the 20 cm mark and the mass to the 10 cm mark

                    • moving the balloon to the 25 cm mark and the mass to the 25 cm mark

                    • moving the balloon to the 20 cm mark and the mass to the 30 cm mark

                    Choose your answer

                    121 mark

                     A beam is pivoted at one end, as shown.  

                    Diagram of a beam with a pivot on the left, a 40 cm distance marked to point X, and a downward force of 6.0 N at X.

                    The beam weighs 6.0 N and its weight acts at a point X 40 cm from the pivot. 

                    A force of 4.0 N is applied to the beam causing it to balance horizontally. 

                    In which direction and where is the 4.0 N force applied?

                    • vertically downwards at 20cm to the left of X

                    • vertically downwards at 20cm to the right of X

                    •  vertically upwards at 20cm to the left of X

                    • vertically upwards at 20cm to the right of X

                    Choose your answer

                    13
                    Sme Calculator                    1 mark

                    An irregularly shaped metal plate is freely suspended from a point P and is in equilibrium, as shown. Point Q is vertically below P.

                    image

                    Which statement about the position of the centre of gravity of the metal plate is correct?

                    • It is at P.

                    • It is at Q.

                    • It is halfway between P and Q.

                    • Further investigation is needed to determine its position.

                    Choose your answer

                    11 mark

                    A uniform beam is pivoted at one end and suspended by a 200 N force as shown in the diagram.

                    The beam is in equilibrium.

                    q2-hard-mcq-1-5--moments-cie-igcse-physics

                     

                    What is the weight of the beam?

                    • 66.7 N

                    • 33.3 N

                    • 1200 N

                    • 200 N

                    Choose your answer

                    21 mark

                    A cardboard rectangle is hung from a nail as shown in the diagram.

                    A plumb line is also hung from the nail.

                    1-6-mcq-h5

                    Which of the points labelled shows the centre of gravity of the cardboard rectangle?

                      Choose your answer

                      31 mark

                      Extended tier only

                      A uniform beam of wood of mass M rests on a pivot. The far left side of the wood is tied to a bolt in the floor with a length of rope with tension T, such that it lies completely horizontal. An object of mass m is placed with its centre of gravity on the very end of the right hand side of the beam.

                      The perpendicular distance from the rope to the pivot is one quarter of the beam's length.

                      Which expression for the mass of the beam is correct?

                      • M space equals space T over g space minus space 3 m

                      • M space equals space 4 T space plus space 12 m

                      • M space equals space T space minus space 3 m

                      • M space equals space T g space minus space 3 m g squared

                      Choose your answer

                      41 mark

                      Extended tier only

                      A "V" shaped object has a sphere attached to either end of the "V" and is balanced on its point. The length of the short arm of the object is l subscript 1. The sphere of mass m subscript 1 is a height h subscript 1 off the ground. The sphere of mass m subscript 2 is a horizontal distance of d subscript 2 from the point of the shape. 

                      1-5-5-h-v-shaped-seesaw

                      The object is in equilibrium. Which expression for d subscript 2 is correct? 

                      • d subscript 2 space equals space fraction numerator m subscript 1 l subscript 1 over denominator m subscript 2 end fraction

                      • d subscript 2 space equals space fraction numerator m subscript 1 square root of l subscript 1 squared space minus space h subscript 1 squared end root over denominator m subscript 2 end fraction

                      • d subscript 2 space equals space fraction numerator m subscript 1 square root of l subscript 1 squared space plus space h subscript 1 squared end root over denominator m subscript 2 end fraction

                      • d subscript 2 space equals space fraction numerator m subscript 1 h subscript 1 over denominator m subscript 2 end fraction

                      Choose your answer

                      51 mark

                      The diagram shows a uniform metre rule. The rule is pivoted at its mid-point. A weight of 4.0 N is suspended from the rule at the 5 cm mark. The rule is held by a string at the 30 cm mark. The rule is in equilibrium.

                      diagram

                      What is the upward force that the string exerts on the rule?

                      • 0.67 N

                      • 4.0 N

                      • 6.0 N

                      • 9.0 N

                      Choose your answer

                      6
                      Sme Calculator                      1 mark

                      The diagrams show four beams, each of negligible weight and freely pivoted.

                      Which beam is not in equilibrium?

                      diagram

                        Choose your answer