Work and Power. Work Work happens when a force moves an object over a distance Work happens when a force moves an object over a distance If the object.

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Work Work is done only when a force moves an object.
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Presentation transcript:

Work and Power

Work Work happens when a force moves an object over a distance Work happens when a force moves an object over a distance If the object does not move, no work is done If the object does not move, no work is done For work to be done, the direction of the applied force must be the same as the direction of the motion For work to be done, the direction of the applied force must be the same as the direction of the motion

Work You lift a bag of groceries You lift a bag of groceries from the trunk of your car Is work being done? Is work being done? You are using force to lift You are using force to lift the bag of groceries, and the force is in the direction of the motion

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

Calculating Work Work = force x distance moved Work = force x distance moved W=FΔd (on your reference table!) W=FΔd (on your reference table!) Units of work are N·m, Units of work are N·m, Also known as the joule Also known as the joule Abbreviated J Abbreviated J Set up the triangle! Set up the triangle!

Calculating Work Work ForceDistance

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? 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? 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? 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? 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 PowerTime

Power Where have you heard of watts before? Where have you heard of watts before? Electrical energy Electrical energy Light bulbs Light bulbs Can you explain why a bulldozer has more power than a person with a shovel? Can you explain why a bulldozer has more power than a person with a shovel? Work and Power Tune Work and Power Tune Work and Power Tune 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? 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? 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? 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? Brynne throws a 12N softball 4m in 1.8s. How much power has she used on the softball?

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