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JOHN_BASH
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PHYSICS
Mechanics
Mechanical Work
Energy's invisible currency: how forces pay the price of motion
10 Feb 2026
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Why does friction do negative work when an object moves across a surface?
Because friction force acts opposite to the direction of displacement, removing energy from the system.
Because friction force acts in the same direction as displacement, adding energy to the system.
Because friction force does not affect energy transfer during motion.
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