Weight Formula

Weight Formulas - How to Calculate Weight from Mass

Weight of a body is defined force on a mass due to gravity.

If m = mass of an object and if g = acceleration due to gravity
   Then weight(W) = mg
Weight for a particular object is dependent on the acceleration due to gravity in a particular gravitational field.

Example:
For a freely falling object of mass 10Kg an upward force of 20N is applied. Find the final acceleration.(g = 10m/s2)
Ans:
Net downward force = weight of the object = 100 N
Net upward force = 20N
Net force = 80N in the downward direction.
So net acceleration = 80/10 = 8Kg

Question:
What will be the weight of an object on moon, if it’s weight is 90N on earth.