# Find the mass by dividing by gravity?

I'm a bit curious and confused. In genereal problems, when they say that something weighs #Newtons, can you just find the mass by dividing by gravity?

krab

Originally posted by Alethia
I'm a bit curious and confused. In genereal problems, when they say that something weighs #Newtons, can you just find the mass by dividing by gravity?
You have to say what you mean by "gravity". If you mean the acceleration of gravity, then the answer is yes: Mass equals weight divided by acceleration of gravity.

Integral
Staff Emeritus
Gold Member
Yes, divide the weight in Newtons by g, $$9.8 \frac{m}{s^2}$$ to get the mass in kg. This of course assumes that you are on the surface of the earth.

Last edited:
russ_watters
Mentor
Originally posted by Integral
Yes, divide the weight in Newtons by g, $$9.8 \frac{m}{s^2}$$ to get the mass in kg. This of course assumes that you are on the surface of the earth.
...and in a place where G = 9.8. It varies by more than most people realize (more than I realized until someone brought it up a month ago here).