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IGCSEPhysicsCambridge (CIE)Exam Questions1. Motion, Forces & EnergyEnergy, Work & Power

Energy, Work & Power (Cambridge (CIE) IGCSE Physics): Exam Questions

Exam code: 0625 & 0972

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Energy, Work & Power

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11 mark

Which energy transfer takes place when a log burns in a fire?

  • Energy is transferred from the nuclear store of the log to the chemical store of the log.

  • Energy is transferred from the nuclear store of the log to the thermal store of the surroundings.

  • Energy is transferred from the chemical store of the log to the thermal store of the surroundings.

  • Energy is transferred from the thermal store of the log to the nuclear store of the surroundings.

Choose your answer

21 mark

Which row correctly matches an energy store with an example of that store?

 

Energy Store

Example

A.

kinetic

a car moving at 70 km / h

B.

elastic

a box sitting high on a shelf

C.

magnetic

compression of springs in a car's suspension

D.

chemical

the nuclei of uranium atoms

    Choose your answer

    31 mark

    Which of the following statements is not a summary of the law of conservation of energy?

    • Total energy in = total energy out

    • There is a finite amount of energy in a closed system that can be transferred from one store to another

    • The total energy in a system is used up as it is transferred from object to object

    • Energy cannot be created or destroyed, it can only be transferred from store to store by a transfer pathway

    Choose your answer

    41 mark

    Identify the incorrect definition of power.

    • A force acting over a distance

    • Work done per unit time

    • Energy transferred per second

    • The rate of work done

    Choose your answer

    51 mark

    Identify the correct energy transfer taking place when an electric kettle is boiling water

    • Chemical energy store → thermal energy store

    • Thermal energy store → chemical energy store

    • Thermal energy store → thermal energy store

    • Nuclear energy store → thermal energy store

    Choose your answer

    61 mark

    A force F acts on an object and the object moves a distance d in the direction of the force. 

    What is the work done on the object?

    • F over d

    • d over F

    • F cross times d

    • fraction numerator 1 over denominator open parentheses F cross times d close parentheses end fraction

    Choose your answer

    11 mark

    A sledge is pushed up a hill with a force, F.

    q1-medium-mcq-1-7-work-energy-power-cie-igcse-physics

    The work done on the sledge depends on the force applied and on a distance moved.

    Which distance?

    • x

    • y

    • z

    • x + z

    Choose your answer

    21 mark

    The law of conservation of energy states that energy cannot be created or destroyed, it can only be transferred from one store to another. 

    Which of the following statements is true?

    • The useful energy and wasted energy transferred away from a system will be equal to the total energy transferred to the system.

    • The useful energy of a system will be equal to the wasted energy of a system.

    • The total energy transferred to a system will be equal to the useful energy transferred away from a system.

    • The total energy transferred to a system will be equal to the wasted energy transferred away from a system.

    Choose your answer

    31 mark

    Which of the following energy transfers is most efficient?

    • Useful energy out = 70%

    • Wasted energy out = 45%

    • Useful energy out = 35%

    • Wasted energy out = 25%

    Choose your answer

    41 mark

    A fork lift truck lifts a heavy box onto a shelf. 

    q3-medium-mcq-1-7-work-energy-power-cie-igcse-physics

    Which action requires the greatest power output from the fork lift truck.

    • Lifting the box from the ground to the high shelf slowly

    • Lifting the box from the ground to the high shelf quickly

    • Lifting the box from the low shelf to the high shelf quickly

    • Lifting the box from the low shelf to the high shelf slowly

    Choose your answer

    51 mark

    A trolley is pushed with a force that causes it to move a certain distance. It moves in the direction it is pushed.

    Which row in the table represents the combination of force and distance that means the smallest amount of work is done on the trolley?

     

    Force / N

    Distance moved / m

    A

    20

    20

    B

    40

    10

    C

    50

    6.0

    D

    70

    4.0

      Choose your answer

      61 mark

      Four different electric bicycles are driven along a road.

      The work done by their motor, and the time taken to do that work is shown in the table below.

      Which of the electric bicycles produces the most power?

       

      Work done / J

      Time taken / s

      A

      10 000

      20

      B

      20 000

      40

      C

      400 000

      400

      D

      2000

      1

        Choose your answer

        71 mark

        The image below shows a simplified layout of a non-condensing gas boiler that is typically used to heat houses in the United Kingdom.

        1-7-mcq-h5

        Which option correctly describes the energy transfers taking place in the boiler?

        • Energy from the chemical store of the fuel decreases as the thermal store of the water increases and the thermal store of the surroundings increases

        • Energy from the thermal store of the fuel decreases as the nuclear store of the water increases and the thermal store of the surroundings decreases

        • Energy from the nuclear store of the fuel decreases as the thermal store of the water increases and the thermal store of the surroundings increases

        • Energy from the electrostatic store of the fuel decreases as the chemical store of the water increases and the nuclear store of the surroundings increases

        Choose your answer

        81 mark

        A man climbs a ladder.

        Which quantities can be used to calculate the useful power of the man?

        • the weight of the man and the time taken only

        • the weight of the man and the vertical distance moved only

        • the work done by the man and the time taken only

        • the work done by the man and the vertical distance moved only

        Choose your answer

        91 mark

        A ball is at rest at the top of a hill.

        The ball rolls down the hill.

        At the bottom of the hill the ball hits a wall and stops.

        Which energy changes occur?

        • gravitational potential energy → internal energy → kinetic energy

        • gravitational potential energy → kinetic energy → internal energy

        • kinetic energy → gravitational potential energy → internal energy

        • kinetic energy → internal energy → gravitational potential energy

        Choose your answer

        101 mark

        A mass hangs vertically from a spring. 

        The mass is raised to a point P and is then released. 

        The mass oscillates repeatedly between point P and a lower point Q. 

        Which energies alternately increase and decrease throughout the oscillations?

        • gravitational potential energy, kinetic energy and elastic energy

        • gravitational potential energy and kinetic energy only

        • gravitational potential energy, kinetic energy and internal energy

        • internal energy and elastic energy

        Choose your answer

        111 mark

        Extended Tier Only

        A car has 620 kJ of kinetic energy. The car brakes and stops in a distance of 91 m. 

        What is the average braking force acting on the car?

        • 0.15 N

        • 6.8 N

        • 6800 N

        • 56 000N

        Choose your answer

        121 mark

        Which row about the change of energy in the energy store must be correct?

        process

        energy store

        change of energy in store

        A

        B

        C

        D

        water pumped up to a high-altitude dam

        gravitational potential energy of water

        increases

        water pumped up to a high-altitude dam

        kinetic energy of water

        decreases

        air passes through a wind turbine

        gravitational potential energy of air

        increases

        air passes through a wind turbine

        kinetic energy of air

        increases

          Choose your answer

          131 mark

          A child runs up a set of stairs four times. The time taken for each run is recorded.

           Which time is measured when the child’s useful power is greatest?

          • 10 s

          • 20 s

          • 30 s

          • 40 s

          Choose your answer

          141 mark

          A woman of mass 50 kg has 81 J of kinetic energy.

           What is her speed?

          • 1.3 m / s

          • 1.6 m / s

          • 1.8 m / s

          • 3.2 m / s

          Choose your answer

          11 mark

          Extended tier only

          A large truck of mass 5000 kg is travelling at 5.0 m/s. A motorbike has a mass of 200 kg. Both the truck and the motorbike have the same kinetic energy.

          What is the speed of the motorbike?

          • 25 m/s

          • 10 m/s

          • 125 m/s

          • 2.5 m/s

          Choose your answer

          21 mark

          Extended tier only

          A penny is held at the top of Blackpool tower. The penny is released and falls a distance h to the ground. It reaches a speed v as it falls.

          As the penny falls, air resistance causes some of the original energy of the penny to be transferred into the air as heat. Which of the expressions below gives the work done against air resistance?

          • ½ mv2

          • mgh + ½ mv2

          • mgh - ½ mv2

          • mgh

          Choose your answer

          31 mark

          Extended tier only

          The diagram below shows a wind turbine. 

          1-7-mcq-h4

          What is the change in the kinetic energy if the wind speed is reduced by half?

          • E subscript K equals 1 over 8

          • E subscript K equals space 1 fourth

          • E subscript K equals space 1 half

          • No change

          Choose your answer

          41 mark

          A crane lifts four pallets of bricks, each of which weigh 5000 N. The crane lifts each pallet a height of 30m. The crane takes 4 minutes to do this.

          How much useful power did the crane produce to lift the bricks?

          • 150 000 W

          • 625 W

          • 2500 W

          • 37 500 W

          Choose your answer

          51 mark

          Extended tier only

          The diagram shows an LED light bulb.

          q5-hard-mcq-1-7-work-energy-power-cie-igcse-physics

          Which expression gives the efficiency of the bulb?

          • fraction numerator 8.0 over denominator 0.5 end fraction cross times 100 percent sign

          • fraction numerator 7.5 over denominator 0.5 end fraction cross times 100 percent sign

          • fraction numerator 0.5 over denominator 8.0 end fraction cross times 100 percent sign

          • fraction numerator 7.5 over denominator 8.0 end fraction cross times 100 percent sign

          Choose your answer

          61 mark

          A rock of weight 50 N falls a vertical distance of 7.0 m from rest.

           What is the change in the gravitational potential energy store of the rock?

          • decrease of 7.1 J

          • decrease of 350 J

          • increase of 7.1 J

          • increase of 350 J

          Choose your answer