science semester review
Terms
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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.