P1 - Conservation & Dissipation of Energy Flashcards
Name the 8 energy stores
magnetic, thermal, chemical, kinetic, electrostatic, elastic potential, gravitational potential, nucleur
Name the 4 energy transfers. How do they transfer energy?
mechanical work - by a force
electrical work - by a current
heating - due to a temp. diff.
radiation - by waves
What is elastic potential energy? Where is it stored?
energy put in to stretch a spring & the spring is storing this energy
What is the extension?
stretch of a spring
What is often directly proportional in springs?
extension & force
What is it called when too much force is applied?
limit of proportionality
What is kinetic energy?
energy stored in moving objects
What is gravitational potential energy?
energy stored in an object due its positions above the Earth’s surface
What is the Law of Conservation of Energy?
energy cannot be created or destroyed, only conserved
Define energy dissipation?
when energy is transf. some of energy is transfr. usefully & some is wasted
What happens to the wasted energy from energy dissipation?
the wasted energy transf. to surroundings causing them to warm up
Describe the energy transfer when a moving car slows down.
enrgy trnsfrrd mchnclly from kinetic store
-> thermal store of brake
some enrgy = dssptd -> thrml store of surroundings
