Question

Why do your hands get warm when you rub them together?

• A. Mechanical energy transforms into heat energy
• B. Heat energy transforms into mechanical energy
• C. Mechanical energy transforms into electrical energy
• D. Electrical energy transforms into mechanical energy

Answer 1

The correct option is A Mechanical energy transforms into heat energy

Hands are moved by muscular force. This is a form of mechanical energy due to motion of hands. As our hands are rough, rubbing hands creates heat due to friction.
So mechanical energy is finally converted to heat.