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Practice: Friction

A wooden block is rubbed back and forth over some sandpaper for one minute. The same block is later rubbed back and forth over some metal for one minute. The block moves at the same speed over the sandpaper and the metal. The metal produces less friction than the sandpaper. Which surface increased the thermal energy of the block more when the block was rubbed over it?

  • AMetal
  • BSandpaper

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