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20 Cards in this Set

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newton's first law of motion is ___________?
I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
newton's second law of motion is ____________?
II. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.
newton's third law of motion is ____________?
III. For every action there is an equal and opposite reaction.
what is a nebulae?
any of numerous clouds of gas or dust in interstellar space.

what a star is born from.
our type of galaxy.
the milky way galaxy is a spiral galaxy.
elliptical galaxy.
a galaxy that has a generally elliptical shape and that has no apparent internal structure or spiral arms.
spiral galaxy.
a galaxy exhibiting a central nucleus or barred structure from which extend curved arms of higher luminosity -- called also spiral nebula

**our galaxy
irregular galaxy.
galaxy that is not able to be classified.

random patterns.
what affects does a medium's density have on waves?
higher density = faster waves.
how do molecules in ocean waves move?
up and down.
what's the speed of waves through a vacum.

**no air.
transverse waves cant travel through a vacuum because there is no medium.

electromagnetic waves travel faster through the vacuum because there is no medium.
define pitch.
how low or high the wave is.
define frequency.
the # of waves in a ceartin time.

how close together the waves are.
rarefaction.
less crowded area [section] of waves.
refraction.
the bending of waves.
SI unit to measure force.
newtons. N
SI unit to measure frequency.
hertz. Hz
list the subatomic particles and the charges associated with each.
proton-positive.
neutron-neutral.
electron-negative.
the evidence to support the big bang theory.
that all galaxy move away from eachother.
what is a light year?
the distance that light travels in one year.