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Vocabulary: Free Fall Tower

Vocabulary: Free Fall Tower


Vocabulary
Accelerate to change speed or direction.
o
In common speech, accelerate usually means to speed up. In reality, any
change in speed (speeding up or slowing down) is considered acceleration.
Air
resistance the force of air pushing against a moving object.
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Air resistance is also called drag.
o
Air resistance increases as speed increases.
o
Air resistance also increases as surface area (size) increases.
Free
fall falling motion caused by the force of gravity.
Gravity the force of attraction between all objects in the universe.
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Earths gravity causes objects to fall to Earths surface.
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Gravity is only significant when one of the objects is very large, like the Earth.
There is very, very little gravitational attraction between you and your couch but
there is some!
Terminal
velocity the constant speed that an object falling through air approaches
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At terminal velocity the force of gravity pulling down is balanced by the force of
air resistance pushing up.
Vacuum a region that contains no matter.
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Outer space is very nearly a vacuum.
o
The Moon has no atmosphere, so the area above the Moons surface is also
nearly a vacuum.