Energy Stores and Transfers
Think of energy like money in different bank accounts - it can move between accounts but never disappears completely. There are eight main energy stores you need to know: kinetic (anything moving), thermal (heat in objects), chemical (stored in fuels and food), gravitational potential (objects with height), elastic potential (stretched or compressed things), electrostatic (charged objects), magnetic (magnets), and nuclear (inside atoms).
Energy transfers happen in four key ways: mechanically (forces doing work), by heating (temperature differences), electrically (moving charges), and by radiation (like light or radio waves). When physicists talk about work done, they simply mean energy transferred - it's the same thing with a different name.
The conservation of energy principle is absolutely fundamental - energy can never be created or destroyed, only transferred between stores or dissipated as waste. In any closed system, the total amount of energy always stays exactly the same, even though some gets "wasted" during transfers.
Key Point: Energy is like money - it can change hands but the total amount never changes!
