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18 Cards in this Set

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  • Back
energy..
can by converted to heat, work, or radiation
kinetic
energy that a body possesses by virtue of its motion

ex pitching ball
potential
energy body possesses by virtue of its position relative to reference point

ex. pendulum
chemical
energy locked in bonds of molecules in form of microscopic potential energy

electric and magnetic forces of attraction b/w different parts of molecule
-same attractive force in thermal vibrations
-in chemical reactions, mol. parts get rearranged to potential energy can be added or released
thermal/heat
energy that combines microscopic, kinetic, potential energy of the molecule

ex. hot beverage, boiling water

temp=how much thermal energy something has
electrical
energy created thru movement of electrons among the atoms of matter
nuclear
energy produced when reactions occur in an atom resulting in structural change in nuclei
fusion
2 small nuclei join together to create 1 large; energy released in form of light and heat

renewable
fission
nucleus of 1 big atom splits into 2 new atoms; tremendous amount of energy released in form of light and heat

nonrewable
radiation
energy radiated or transmitted in form of rays, waves, or particles

ex. visible light, UV radiation
electromagnetic radiation
energy that oscillates (side to side) and is coupled with electric and magnetic fields that travel freely through space

composed of photons (packets of energy) which are created when electrons jump energy levels or charged particle is accelerated
spectrum
high wavelength, low frequency= low energy
worlds energy
US consumes 1/4 of world's energy

get 22 thousand times more energy from sun than we consume.. but energy is not in readily usable form, needs to be concentrated
Renewable energy sources
can be replenished over and over again, never depleted

hydropower, solar, wind, tidal, geothermal from earth, biomass from plants, nuclear fusion

usually converted into electricity or thermal energy
Nonrenewable energy
cannot produce in short period of time;

fossil fuels (natural gas, oil, petroleum), tar sands, nuclear fission

Uranium with nuclear fission to create heat and electricity

usually converted into electricity or mechanical energy

where we get most of our energy
power
= rate at which we do work

= energy (work)/ time
energy
the capacity to do work

= power x time
work
amount done