What is Gravity Force (Fgrav):
Force with which the earth, moon, or massively large object attracts another object towards itself. By meaning, this is the weight of the object. All objects upon earth experience a force of gravity that is fixed "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 = mass x gravity x m = mass (in kg), g = 9.8 N/kg