Fgrav=m*g (warning!)

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Gravity Force
(also known as
Weight)
Fgrav
The force of gravity is the force with which the earth,
moon, or other massively large object attracts another
object towards itself. By definition, this is the weight of
the object. All objects upon earth experience a force of
gravity that is directed "downward" towards the center
of the earth. The force of gravity on earth is always
equal to the weight of the object as found by the
equation:
Fgrav = m * g
where g = 9.8 N/kg (on Earth)
and m = mass (in kg)
(Caution: do not confuse weight with mass.)
Normal Force
Fnorm
The normal force is the support force exerted upon an
object that is in contact with another stable object. For
example, if a book is resting upon a surface, then the
surface is exerting an upward force upon the book in
order to support the weight of the book. On occasions, a
normal force is exerted horizontally between two
objects that are in contact with each other. For instance,
if a person leans against a wall, the wall pushes
horizontally on the person.