Why does friction create heat?
Quick Answer
Friction turns organized motion into random molecular motion, which we experience as heat. The energy is conserved, but it changes form.
The Full Story
When two surfaces rub against each other, tiny surface irregularities interact and resist motion. The work done against that resistance does not disappear; it is converted into internal energy of the materials. That extra microscopic motion raises temperature, which is why hands warm up when rubbed together. Friction is essential for walking, braking, and writing, but it also causes wear and energy loss. Engineers reduce unwanted friction with lubricants, bearings, and low-friction materials.
Key Facts
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