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Q.

Which of the following forces is responsible for the production of heat when we rub our hands?

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a

Electrostatic force

b

Gravitational force

c

Electrostatic force

d

None of above

answer is D.

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Detailed Solution

The frictional force is responsible for heat production when we rub our hands.
When we rub our hands together, the action of rubbing the surface of our skin back and forth against each other causes the molecules in our skin to move fast. The temperature will be high or low depending on how fast the molecules move. So our hand feels warmer when we rub them together due to friction. Or when surfaces in contact are in relative motion, friction between the two surfaces transforms the kinetic energy into thermal energy.

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