Work and Power.

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Presentation transcript:

Work and Power

Work …….. If the object does not move, no work is done For work to be done, the direction of the ……………must be the same as the direction of the …………….

Work You lift a bag of groceries from the trunk of your car Is work being done? ……………..

Work You carry a bag of groceries from the car to the kitchen Is work being done? You are using force to carry the groceries Is the force being applied in the direction of the motion? …….

Calculating Work Work = ………. x ………. moved W=…..Δ…. (on your reference table!) Units of work are ……… Also known as the joule Abbreviated J Set up the triangle!

Calculating Work Work Force Distance

Work Practice 60N of force is used to move an object a distance of 4.0m. How much work has been done on the object?

Work Practice When you pick up your backpack, you do 58J of work to lift it up 1.3m to put it on your back. What is the force on the backpack?

Work Practice A tow truck tows your car 2200m to the nearest service station. If the truck did 2,970,000J of work to tow the car, what was the force on the car?

Work Practice A crane lifts a steel beam with 5200J of work. If the force on the beam is 240N, what is the distance the beam has been lifted?

Power  

The Power Triangle Work Power Time

Power Where have you heard of watts before? …….. ……… Can you explain why a bulldozer has more power than a person with a shovel? …………. Work and Power Tune

Calculating Power Espen and Deion push a sofa across a room in 16 seconds using 142J of work. How much power did they use?

Calculating Power KJ uses 72J of work to push a textbook across the table. He uses 432W of power. How long did it take him to move the book?

Calculating Power Aniké and Alanah move the lab table for 3 seconds using 98W of power. How much work did they do?

Calculating Power Brynne throws a 12N softball 4m in 1.8s. How much power has she used on the softball?

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