Work and Power notes: In science, ‘work’ has a specific meaning

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WORK and POWER!.

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Presentation transcript:

Work and Power notes: In science, ‘work’ has a specific meaning Work is ONLY done when a causes a change in the of an object in the of the applied force i.e. WORK EQUATION: Work = W = F x d

is measured in . 1 J = 1 N•m = 1 kg•m2/s2 1 joule is roughly equal to the energy required to lift a small apple 1 meter *N measures force/weight *m measures mass... To find weight in N, need to use w=mg James Prescott Joule

Practice! A crane uses an average force of 5200 N to lift a crate 25 m. How much work does the crane do on the girder?

An apple weighing 1N falls a distance of 1m An apple weighing 1N falls a distance of 1m. How much work is done on the apple by the force of gravity?

A mechanic uses a hydraulic life to raise a 1200 kg car 0 A mechanic uses a hydraulic life to raise a 1200 kg car 0.5 m off the ground. How much work does the lift do on the car?

POWER POWER is how much work is done in a given time POWER: the rate at which or energy is converted. power = work / time Measured in 746 watts = 1 horsepower

Practice While rowing across the lake during a race, John does 3960 J of work on the oars in 60.0 s. What is his power output in watts?

Using a jack, a mechanic does 5350 J of work to lift a car 0 Using a jack, a mechanic does 5350 J of work to lift a car 0.500 m in 50.0 s. What is the mechanic’s power output?