space
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astronomical unit
distance form the sun to the Earth -one au= 149, 597, 870.7 km
light year
distance light can travel in 365.25 days - one ly= 9,460,730,472,580.8 km
mass
the amount of matter that exsists within an object -how much resistance an object has without changing
momentum
the motion of a moving body as a result of mass X velocity
gravity
the force of attration between all objects with mass
function of gravity
pull toward the center of mass of an object
affects of gravity can be altered in 2 ways:
mass and distance
gravity alter mass
-the greater the mass of an object the greater the gravitational pull -the small the mass of an object the weaker the gravitational pull
gravity alter distance
-the closer the objects are the greater the gravitational pull -the further away the objects are the weaker the gravitational pull
orbit
the curved path that an object takes to travel around another object that typically has a higher mass
weight
how that mass is affected by gravity
elliptical
oval in shape (path)
weight unit of meausre
newtons
mass unit of measure
kilograms
gravity unit of measure
constant on earth at 9.8 m/s squared
formula for weight
W=mg
spiral
the very cool pinwheeled shape
lenticular
a cross between spiral and ellipitical
ellipitical age
very old
irregular
no defined shape -thought to be caused by collisions
rotation
the Earth rotates on it’s axis (imaginery vertical line around in whcih earth spins) -every 24 hours
revolution
the time it takes the Earth to travel or revolve around the sun once -365.25 days
seasons
caused by changes in the length of time a side of the Earth is exposed to sunlight
solstice
-occurs twice a year -tilted the closest -winter is shortest day of the year -summer is longest day of year