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20 Cards in this Set
- Front
- Back
newton's first law of motion is ___________?
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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.
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newton's second law of motion is ____________?
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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.
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newton's third law of motion is ____________?
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III. For every action there is an equal and opposite reaction.
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what is a nebulae?
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any of numerous clouds of gas or dust in interstellar space.
what a star is born from. |
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our type of galaxy.
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the milky way galaxy is a spiral galaxy.
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elliptical galaxy.
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a galaxy that has a generally elliptical shape and that has no apparent internal structure or spiral arms.
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spiral galaxy.
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a galaxy exhibiting a central nucleus or barred structure from which extend curved arms of higher luminosity -- called also spiral nebula
**our galaxy |
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irregular galaxy.
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galaxy that is not able to be classified.
random patterns. |
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what affects does a medium's density have on waves?
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higher density = faster waves.
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how do molecules in ocean waves move?
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up and down.
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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. |
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define pitch.
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how low or high the wave is.
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define frequency.
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the # of waves in a ceartin time.
how close together the waves are. |
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rarefaction.
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less crowded area [section] of waves.
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refraction.
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the bending of waves.
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SI unit to measure force.
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newtons. N
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SI unit to measure frequency.
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hertz. Hz
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list the subatomic particles and the charges associated with each.
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proton-positive.
neutron-neutral. electron-negative. |
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the evidence to support the big bang theory.
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that all galaxy move away from eachother.
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what is a light year?
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the distance that light travels in one year.
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