T4: energy

Cards (11)

8 energy stores?
kinetic, chemical, thermal, elastic potential, electromagnetic, nuclear, gravitational potential, magnetic
4 transfers of energy?
by heating, by radiation, electrically, mechanically
principal of conservation of energy?
energy can be moved, stored or energy can be stored, transferred between stores or dissipated, but cannot be made or destroyed
energy transfers have some loss of energy to environment - usually thermal energy
example: a ball rolling up a slope?
energy transferred mechanically from kinetic store to gravitational potential store. some is transferred mechanically to thermal store and the slope by friction
mechanically transferred?
due to a force acting upon it
electrically transferred?
a charge moving through a potential difference
transferred by heating? 
energy from hotter object to colder object
transferred by radiation? 
energy transferred by light/sound waves etc
example: a bat hitting a ball?
energy transferred mechanically from kinetic energy of bat to kinetic energy of ball. rest of energy is wasted - transferred mechanically to thermal and sound energy
example: electric kettle boiling water?
energy transferred electrically to the thermal energy store from the mains, transferred by heating to thermal energy store in water - rest is waste energy heated to surroundings via steam