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You're told at school that forces that are at ninety degrees to the direction of motion don't do work. But when you push something vertically that is moving on a rough plane, you increase the friction force that is in the direction of motion. So, why doesn't this force do work? You know that cos(90) = 0, but can you explain this conceptually?


You're told at school that forces that are at ninety degrees to the direction of motion don't do work. But when you push something vertically that is moving on a rough plane, you increase the friction force that is in the direction of motion. So, why doesn't this force do work? You know that cos(90) = 0, but can you explain this conceptually?


Grade:10

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