Work and Power

Work and Power

Work and Power

​Basic formula:

W = F x S

​P = W/t

​F = Force in the horizontal direction

​S = Distance

​W = Work

​P = Power

​t = time

​W = F x S

First condition​

​Force is parallel to the distance and direction

​W = F x S

Second condition

​Force creates an acute angle on the distance line

​W = Fcos(theta) x S

Third condition

​Force creates a right angle on the distance line

​W = 0

Fourth condition

​Force creates an obtuse angle on the distance line

​W = -F x S

Breaking down forces

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Find the value of the horizontal force. Angle = 60

First condition​

​Force is parallel to the distance and direction

​W = F x S

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Jimmy is pushing a table across the restaurant from the counter to the front door which is 20 meters long with a force of 50N. How much work did Jimmy use?

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Jerome is walking in a straight line from his house to the mailbox. He did 2000J of work and uses a force of 25N. How long is the his house to the mailbox

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A construction worker is pulling a metal bar with a force of 20N towards the construction site with a distance of 350cm. How much work did the worker do?

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A black man is holding a box and walking towards the payload truck. How much work has been accumulated by the black man.

Second condition

​Force creates an acute angle on the distance line

​W = Fcos(theta) x S

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A helicopter is lifting a supply box at an angle of 60 degrees with a force of 20N from the operation base to the site which has a distance of 5km

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How much work is done to the box?

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Find how much work is done from x = 0 to x = 2

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Find how much work is done from x = 2 to x = 5

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Find how much work is done from x = 5 to x = 11

​Power

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Krack uses 20J to push a box from his house to the front fence using 10 seconds.

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Herald uses 50N to push a a chair from his bedroom to the living room that is 30m apart. He uses a total of 15 seconds to do so. How much power did Herald use?

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How much power is from x = 0 to x = 7 if it uses 5 seconds