###### Asked in Units of MeasurePhysicsWeight and Mass

# How many kilograms are in a newton?

## Answer

###### Wiki User

###### October 07, 2009 12:09AM

Newtons don't convert directly to kilograms because the Newton
is the SI unit of force, and the kilogram is the SI unit of
mass.

Mass is different from force or weight, because mass is independent
of gravity. Weight is a force and is measured in Newtons and mass
is measured in kilograms.

Force = mass x acceleration, F=ma

The confusion comes from the way we often use kilograms as though
we are talking about weight, because we are almost always talking
about weight on Earth. Your weight would be different on Earth and
on the moon, because these places have different strengths of
gravity, but your mass would be the same.

A Newton is defined as the force required to accelerate a mass of 1
kilogram at 1 ms-2. (one metre per second per second)

On Earth, where the gravitational acceleration is approximately
9.8ms-2, (9.80665002...ms-2), the weight (the force from the
gravity of Earth) of an object with a mass of 1kg is ~9.8N.

a= 9.8ms-2

m=1kg

therefore F= m x a = 9.8N

If an object has a weight on Earth of 1N then it has a mass of
~0.1kg.

a = 9.8ms-2

F = 1N

m = F / a = ~0.1kg