The force depends on how strong the pull of gravity is where you are (e.g. on the moon the pull would be less) but on earth gravity has a pull of roughly 9.8 Newtons/kg so:
N = mass (kg) x 9.8
N = 0.9kg x 9.8
N = 8.82
8.82 Newtons
The pull of gravity on an object's mass is called its weight. Weight is the force of gravity acting on an object due to its mass.
weight
gravity
If compared to earth, mercury has little gravity pull as its mass is much less than earth's mass.
As mass increases, the response to the pull of gravity also increases. Gravity is directly proportional to mass, so an increase in mass will result in a stronger gravitational force pulling objects together.
mass and pull
The pull of matter on an object is known as gravity. Gravity is a force that attracts objects with mass towards each other. The strength of the gravitational pull depends on the mass of the objects and the distance between them.
Weight is the measure of the pull of gravity. Weight is the mass of an object and can be measured by using a scale.
The measure of the pull of gravity on a given mass is its weight. Weight is the force exerted by gravity on an object with mass and is calculated as the mass multiplied by the acceleration due to gravity (9.8 m/s^2 on Earth).
The pull of Earth on you is called gravity. Gravity is the force that attracts objects with mass towards each other.
Its weight
mass and gravity