Energy stores and Systems
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17 Terms
what is energy stores and system
Energy cannot be created or destroyed, however it can be stored or transferred in many different ways.
Kinetic
energy stored by an object that is moving.
Magnetic
energy stored by two magnets attracting or repelling one another.
Thermal
energy stored in an object due to the heat of the object.
Chemical
energy stored by chemical bonds.
Elastic Potential
energy stored by an object that has been stretched or squashed.
Electrostatic
energy stored by two charges attracting or repelling one another.
Gravitational Potential
energy stored by an object when it is lifted to a height.
Nuclear
energy stored inside the nuclei of atoms.
energy transfer - Mechanical Work
when a force moves an object a distance.
energy transfer - heating
when energy is transferred to a colder object from a hotter object.
energy transfer - electrical work
when energy is transferred by a moving charge due to a potential difference
energy transfer - radiation
when energy is transferred as an electromagnetic wave e.g. gamma-rays or UV radiation.
what is a system
a system is an object or a group of objects that you are dealing with
whenever a system changes energy changes
closed system
can neither enter nor leave the system. This means that whenever energy is transferred in the system, the total energy remains the same, or net change =0=0.
open system
can be transferred into or out of the system.
