1) Would Peter do more work if he ran instead of walking up a hill? a) Yes b) No 2) How much work does Paul do when he lifts a box weighing 250N off the floor to a shelf 2m high? a) 500J b) 0.005kJ c) 125J d) 125kJ 3) Tom does 3000J of work in pushing a small van a distance of 10m. How big is the friction force he has to push against? a) 30,000N b) 0.003N c) 300N d) 3000N 4) Beth is stacking a food shelf with tins each weighing 12N. When she has put 20 tins on the shelf she calculates she has done 288J of work. How high is the shelf? a) 24m b) 3456m c) 240m d) 1.2m 5) On a building site Crane A lifts a steel girderonto a building in 60 seconds. Crane B takes 40 seconds to do the same job which is the most powerful? a) Crane A b) Crane B 6) Neil can lift 20 weights, each weighing 30N, through a height of 2m in 60 seconds. Calculate Neils power. a) 600W b) 300W c) 1200W d) 20W 7) Sarah can do 24 step ups in 30 seconds the step up is 12cm high calculate Sarah's power if she weighs 500N a) 2.88W b) 60W c) 48W d) 1440W 8) A 25kW motor raises a 5000N load through a height of 40m. How long does it take? a) 200,000s b) 8s c) 8000s d) 200s

Power and Work done quiz

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