The Laws of Thermodynamics Govern Energy Flow

- Potential energy: stored energy.
- Kinetic energy: energy due to motion.
- Chemical potential energy: a form of potential energy related to the structural arrangement of atoms or molecules.

In the case of a bow and arrow, the energy

 is converted from the potential energy in the

 archer's arm to the potential energy in the bent

 limbs of the bow when the string is drawn back.

 When the string is released, the potential energy

 in the bow limbs is transferred back through

 the string to become kinetic energy in the arrow

 as it takes flight.




Kinetic energy: energy due to motion.

File:Wooden roller coaster txgi.jpg

The cars of a roller coaster reach their

maximum kinetic energy when at the bottom

of their path. When they start rising, the kinetic

energy begins to be converted to

gravitational potential energy. The sum of

kinetic and potential energy in the system

remains constant, ignoring losses to friction.









1st Law of Thermodynamics: energy can't be created or destroyed but can be converted from one form to another.




2nd Law of Thermodynamics: when energy is transferred or transformed, part of the energy assumes a form that can't pass on any further.