Energy Stores

Energy is never used up. Instead, it's just transferred between different energy stores...

When energy is transferred to an object, the energy is stored in one of the object's energy stores.

The energy stores:

• Thermal energy stores
• Kinetic energy stores
• Gravitational potential energy stores
• Elastic potential energy stores
• Chemical energy stores
• Magnetic energy stores
• Electrostatic energy stores
• Nuclear energy stores

Energy is transferred mechanically, electrically, by heating or by radiation.

• A system is just a single object or a group of objects.
• When a system changes, energy is transferred. It can be transferred into or away from the system, between different objects in the system or between different types of energy stores.
  
• Closed systems are systems where neither matter nor energy can enter or leave. The net change in the total energy of a closed system is always zero.