Force of gravity is what we call "weight".
It's the product of (mass) x (acceleration due to gravity).
On Earth, acceleration due to gravity is about 9.81 meters per second-squared.
It's different in other places. Example: It's about 1.62 on the Moon.
So the weight of any mass on Earth is (9.81) x (the mass), in Newtons.
The weight of the SAME mass on the Moon is (1.62) x (the mass), in Newtons.
