Answers to Practice Questions

1.A man lifts a box of fruit with a weight of 200N from the ground to 1.5m above the ground. Calculate the work done.

Work done = force x distance moved in the direction of the force

Work done = 200N x 1.5m = 350J

2. A ferromagnetic crane lifts some scrap iron of weight 20kN upwards from the ground, travelling a distance of 350cm. Calculate the work done.

350cm = 0.35m

20kN = 20,000N

Work done = force x distance moved in the direction of the force

Work done = 20000N x 0.35m = 7000J

3. 40000J of work is done to push a car of weight 7000N along a length of road. Calculate how far the car travels. 

Work done = force x distance moved in the direction of the force

Distance = work done/force

Distance = 40000/7000 = 5.7m

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