Are the following definitions of weight valid; The force of gravity pulling on a mass? The force between two bodies due to the force of gravity? Q. Does weight only apply to the force due to gravity on a body in relation to a planet (or satellite, asteroid etc), eg, a man standing on Earth or on The Moon? Or can we talk about the weight of, say, a very small object (eg, a pebble) in relation to a relatively larger object (eg, a person)?