Energy Stores
Energy and its Forms
Energy is transferred between different forms and objects.
Forms of energy include thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, and nuclear energy.
Energy can be transferred between these forms mechanically, electrically, through heating, or radiation.
Collection of Matter
A system is a collection of matter in physics.
Energy is transferred within a system or between objects/forms.
In an open system, energy can exchange with the outside world, while a closed system is isolated.
In a closed system, energy transfer within the system results in an overall zero change.
Examples
Example with a kettle illustrates energy transfer from electrical to thermal energy.
Work done is another term for energy transferred, with mechanical and electrical work being key types.
Mechanical work involves using force to move objects, while electrical work is overcoming resistance in circuits.
Practice
Example of a train applying brakes to slow down, transferring kinetic energy to thermal energy.
Friction between brakes and wheels causes energy transfer.
Energy stores change as work is done, affecting the system's energy balance.