Answer:
When you rub your hands together, the action of scraping the
surface of your skin back and forth against each other causes
the molecules in your skin to move a little faster. The faster
that molecules move, the higher the temperature. So the
friction of rubbing your hands together makes them feel
warmer.
The force is friction. It's a force that opposes motion. It is present whenever two surfaces rub over each other, such as when you rub your hands together, or when you apply the brakes on a bike or in a car.
Explanation: I hope this helped you!
