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ARC-Easy / Mercury_SC_415699 / Why do two surfaces get warm when they are rubbed together?

Problem

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question

Why do two surfaces get warm when they are rubbed together?

choices

  • The surfaces absorb energy from the air.
  • Friction changes energy of motion to heat energy.
  • Moving objects produce heat energy.
  • Energy is transferred between the two surfaces.

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Source and history

Official source

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