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If your question is referring to an object on Earth, simply use Newtons force equation and the acceleration due to gravity here on Earth.

Force = Mass*Acceleration

Acceleration =: Gravitational acceleration on Earth is 9.81m/s2 or 32.2 ft/s2

Mass =: You will need to know the mass or the object in kilograms or pounds

Force =: Multiply the above to parameters together and you have your force due to gravity with units of Newtons (kg*m/s^2) or Pounds Force (lb*ft/s^2)

NOTE: This is all assuming that your object is on a flat surface. While the force will be the same, if it is on an incline or something like that, the force of your object on the surface it sits will be the cosine of some angle.

-So for the case where your object is on an incline plane, at angle theta, you have a normal force acting perpendicular to the incline plane, and the gravitational force acting in the x direction (straight down). The normal force is given by the following:

FN = FG*cos(theta)

where FG is the gravitational force

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