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Chapter 2 notes
gravity and motion
16
Astronomy
Undergraduate 1
09/14/2006

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Term
inertia
Definition
is the tendancy of a body at rest to stay at rest. and a body in motion to keep moving, in a straight line
Term
newton's first law of motion
Definition
a body continues in a state of rest or motion in a straight line at a constant speed unless made to change that state by forces acting on it.
Term
Accelration
Definition
any change in speed and direction
Term
Newton's 2nd law of motion.
Definition
the amount of acceleration (a) that a force (f) can produce depends on the mass (m) of the object being accelerated.
Term
Newton's law of gravity
Definition
Every mass exerts a force on every other mass. the strenght of the force is directly proportional to the product of the masses divided by the square of their seperation.
Term
Newton's third law of motion
Definition
when two objects interact they create equal and opposite forces on each other.
Term
surface gravity
Definition
measures the gravitional attraction at a planets or star's surface.
Term
Asterism
Definition
an easily identified grouping of stars often a part of a larger constellation
Term
declination
Definition
line East and West of a star chart
Term
right ascension
Definition
"RA" the north and south lines of a star chart.
Term
alitude
Definition
is an objects angle above the horizon.
Term
conjuction
Definition
when a planet lies in the sky with the direction as the sun.
Term
inferior conjuction
Definition
planet lies between us and the sun.
Term
superior conjuction
Definition
a planet is on the other side of the sun.
Term
a transit
Definition
when a planet moves in front of the sun and is silhoutted by the sun.
Term
opposition.
Definition
when a planet is directly opposite the sun in the sky.
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