| Free-body
Forces |
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| n | Fg
is the force of gravity or |
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| weight of an
object (always |
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| straight down) |
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| n | FN
is the “normal” force (the |
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| force of a
surface pushing up |
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| against an
object) |
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| n | Ff
is the force of friction which |
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| is always
opposite the motion |
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| n | Fa
is the force of acceleration |
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| caused by a push
or pull |
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