work. lifting books out of your backpack? carrying your backpack to class? pushing a car that is...
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Work
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Lifting books out of your backpack? Carrying your backpack to class?
Pushing a car that is stuck in the snow?
Rolling a bowling ball?
What is Work?
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Is this cat doing work?
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Work is done on an object when the object moves in the same direction in which the force is exerted.
What is Work?
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Sometimes force is applied to an object, but no work is
done.
If you push on a block and it doesn’t move, you have not
done ANY work in the scientific sense.
Which force is most likely to do
work on the block?
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Work is done by forces over a distance. Work is done on objects. When force is measured in newtons and
distance in meters the SI unit for work is the newton*meter
A newton*meter is called a Joule
Calculating Work
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To calculate work, you multiply the force by the distance the object moves in the direction of the force.
Calculating Work
How much work is done if the block is raised 3 meters?
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Force (F)= 50 N distance (d)= 0.5 m
How much work is done on a 10-newton block that is lifted 5 meters off the ground by a pulley?
Practice Time!