Answer :
The flow of energy starts in in you arms. You put your hands together, and use your arms to move your hands back and forth, this is kinetic energy. Your hands rubbing together causes the molecules to bump into each other, this is friction. As the molecules bump into each other they begin to move faster, and the fast movements of the molecules is what creates heat.
Friction produced by little by rubbing the hands together .Energy transfers from one form to another by rubbing the hands together.
People rub their hands together,friction turns mechanical energy(the motion of our hands) into thermal energy (the hands get warmer). Heat engine do just the opposite,they take the energy from being warm(compared to the surroundings) and turn that into motion.
Energy flow
Energy flow is the flow of energy through living organisms within an ecosystem.Living organisms can use energy in two forms radiant and fixed energy.
Radiant energy
Radiant energy in sorts of electromagnetic waves,such as light.
Fixed energy
Fixed energy is potential energy bound in various organic substances which may be weakened so as to release their energy content.
Thus, the flow of energy that causes the warm to be produces by friction turns energy into thermal energy.
Learn more about the energy flow here:
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