matter
fourth state of matter rarely found on Earth
plasma
a device that makes work easier
simple machine
If you weigh 120 pounds on Earth, how much on the moon
20
main energy source for Earth
Sun
two main types of energy
potential, kinetic
name of phase change from solid to gas
sublimation
force that makes work difficult
friction
length of time for Moon's revolution and number of phases
lunar month, about 27 days, 8phases
second planet from sun
Venus
name two of the four types of potential energy
gravitational, nuclear, store mechanical, chemical
state of matter that has volume, and molecules slide around each other
liquid
name all six simple machines
screw, wedge, lever, wheel and axle, pulley, inclined plane
During fall in the US, the axis is tilted _______
away from sun
what type of heat energy transfer is due to the sun
radiant
a parked car is an example of what specific energy
potential-stored mechanical
how do you change the state of matter
add or take away energy/heat
name the simple machine that describes stairs
inclined plane
difference between rotate and revolve
rotate-spin, revolve to go around
what object is located at the center of the solar system
sun
What is the Law of Conservation of Energy
cannot be created nor destroyed
decribe molecule movement in each of the three state of matter
solid-rigid, barely moving
liquid-sliding past eachother, no structure
gas-rapidly moving around, expanding
difference between invention and discovery
invention-human created
discovery natural occurrence found
explain how craters are formed
meteorite hits the surface of a planet or moon
describe the suns life cycle
nebula, low mass star, red giant, white dwarf
difference between renewable and nonrenewable energy
non-cannot be replaced
renewable-replinished in short time