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Work and Power. Work done = Force × distance Work The unit of work is the joule (J). Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?. Energy is the ability to do work The unit of energy is also the joule.

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## Work and Power

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**Work done = Force × distanceWorkThe unit of work is the**joule (J).**Amy uses 20N of force to push a lawn mower 10 meters. How**much work does she do?**Energy is the ability to do workThe unit of energy is also**the joule.**PowerPower is the rate at which work is doneThe unit of**power is the watt (W)**Lets do an example!**• The driver of a moving car applied the brakes. • The brakes produced an average stopping force of 8 kN (8000 N) and the car stopped having travelled 20 m after the brakes were applied. • Calculate the work done in stopping the car.**Calculate the power of this if it takes 5 seconds for the**car to stop**A girl of mass 60 kg (weight 600 N) climbed a 6 m high**stairs in 15 seconds. • Calculate the work she did and the average power she developed while climbing the stairs.**A mouse applied a force of 4Newtons to lift a weight 1meter**off the ground. • What is the work done?**And the power if it takes the mouse 3 seconds to lift the**weight

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