Multiple choice

Why do palms become hot after rubbing them?

  1. Force

  2. Friction

  3. Pressure

  4. Environmental heat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When you rub your palms together, the friction between the skin surfaces converts kinetic energy from the rubbing motion into thermal energy (heat). This is why friction always produces warmth - it's energy transformation from mechanical to thermal.

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