When we pull on a spring, the amount of force required changes with the distance the spring is stretched. The further we pull the spring from the origin, the harder it is to pull. How much work is done if we stretch the spring from zero to 8 centimeters?
Work is equal to force times distance
W=Fâ‹…d
It's hard to see the amount of work done in the picture of the spring. A simple way to think about work (as opposed to force) is that doing work requires energy and makes you tired. To show how much work is being done, we change the color of the background. As the amount of work done pulling the spring goes up, the background gets redder.
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