Phys GeoG, Test 1 pt 5

potential energy

stored energy, energy of position; gravity is very important; PE = mgh

kinetic energy

energy of motion; KE = ½mv²

phase

state of matter

phases of water

1. solid (ice, snow)

2. liquid

3. vapor/steam

sensible heat

can be sensed as temp; change of energy = temp change; slopes on the graph

latent heat

hidden; no temp change; when there’s a phase change (ex: ice to water); flats on a graph

radiation

electromagnetic waves, light

molecular transfer

energy is conducted through a metal pot and moving towards the handle of the pot

temp is a measure of…

motion, more motion when it’s hotter

convection

the phase before a rolling boil; water rises along the sides of a pot as it gets hotter, sinks in the middle of the pot when it cools (a donut motion); circulation of fluid

how does energy travel from space to earth?

as rays of light; shines down and bounces off the clouds or earth and is reflected into space as reflected light; the energy can be absorbed by the earth as heat

clear night

temp will drop because energy is traveling back to space

cloudy night

clouds trap the energy

watt

measure of energy; created by James Watt (invented the steam engine)

reflectivity

shininess, albedo (mirror)

earth’s albedo

31% of light is reflected back into space, 69% is absorbed by the earth

moon’s albedo

6% of light is reflected back into space, very very dark