1) Which is a correct example of work being done? a) An apple sitting still on a table b) A shelf holding up a book c) A toy car being pushed across the floor 2) What are the correct units for work? a) Joules (J) b) Amps (A) c) Newtons (N) 3) How much work is done by a 10N force pushing a box 4m across the floor? a) 40J b) 14J c) 2.5J 4) If a motor does 500J of work to lift a 200N weight, how high was the weight lifted? a) 0.4m b) 2.5m c) 300m 5) Which of the following is a definition of power? a) The amount of work done by a certain force b) The energy transferred x time taken c) The amount of work done / time taken 6) A hairdryer transforms 10,000J of energy in 4s. What is its power? a) 40,000 W b) 2,500 W c) 25,000 W 7) A 60 W lamp is left on for 20s. How much energy has been transformed? a) 1200J b) 80J c) 3J 8) In an electric kettle, which energy is not wasted? a) The energy that heats the water b) The energy that dissipates out of the kettle into the surroundings c) The sound heard as the kettle boils 9) What is the efficiency of Christmas lights that give out 10 W of light radiation for an electrical power input of 200 W? a) 20% b) 10% c) 5% 10) How might a toy car be made more efficient? a) Push it with a greater force b) Press down on it harder c) Add a little oil to the moving parts

KS4 Physics Work, Power and Energy

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