Energy Flashcards
(27 cards)
definition of energy store
places or objects where energy is contained or stored
definition of energy transfers
pathways which energy can be transferred from one place to another
what are the energy stores
kinetic
gravitational potential energy (GPE)
Chemical
Nuclear
Magnetic
Thermal
Electrostatic
Elastic
definition of kinetic energy
energy of a moving object
definition of GPE
energy of an object due to its height above a surface
definition of chemical energy
energy stored in fuel which is released when a chemical reactions takes place
definition of nuclear energy
energy released from nuclear reactions
definition of magnetic energy
energy when repelling poles have been pushed closer together or when attracting poles have been pulled further apart
definition of thermal energy
energy of an object due to its temperature
definition of electrostatic energy
energy of an object due to the repelling charges made close together or when attracting charges have been pulled further apart
definition of elastic energy
energy stored when an object is stretched or squashed
definition of mechanical transfer
a force moving an object through a distance
definition of electrical transfer
transfer of energy and matter through the flow of charges in a circuit
definition of heating
energy transfer between objects at different temperatures
definition of radiation
energy transfer through waves
what is the law of conservations of energy
energy can neither be created nor destroyed, it can only be stored or transferred
definition of energy wasted
energy transferred in a way that is no longer useful
definition of sankey diagram
shows the transfer of energy
definition of efficiency
proportion of the energy supplied that is transferred in useful ways
equation of efficiency
( useful energy / total energy supplied ) x 100
definition of work done
when a force moves something. when energy is transferred from one store to another
equation for work done
W = F x d
work done = force x distance
equation for GPE
GPE = mgh
mass x gravitational field strength x height
equation for Kinetic energy
KE = 1/2 x m x V^2
1/2 x mass x (speed)^2
