Using a bow and stick, friction is generated to create heat sufficient to ignite tinder and produce fire. The bow, when rapidly moved back and forth, causes the stick to rotate against a wooden base, generating significant heat through friction. This process demonstrates the conversion of mechanical energy into thermal energy, aligning with the principles of the first law of thermodynamics. The demonstration not only showcases an ancient method of fire-starting but also provides a tangible example of how energy transformation can achieve a practical outcome, emphasizing the fundamental concepts of energy conservation and conversion.