Work and Power

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$W=Fd$  You push a refrigerator with a force of 100 N. If you move the refrigerator a distance of 5 meters while you are pushing, how much work do you do?

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How much work do you do when you lift a 50 N child 0.5 m?

$W=Fd$  

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$W=Fd$  The brakes on a car do 240,000 J of work in stopping the car. If the car travels a distance of 40m while the brakes are being applied, how large is the average force that the brakes exert on the car? (solve for Force)

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Challenge: The force needed to lift an object is equal to the size of the gravitational force on the object. The acceleration of gravity is known to be 9.8m/s^2. How much work is done in lifting an object that has a mass of 5 kg a vertical distance of 2m? (HINT: this is a multi step problem)

$W=Fd$  

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You do 950 J or work to move a sofa. It tool you 5 seconds to move the sofa. How much power did you use?

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You push a wheelbarrow with a force of 45 N as distance of 30 meters in 10 minutes.  How much Power did you use??