Q.As we go from one planet to another planet, how will the mass and weight of a body change?

[!TLDR] Mass never changes from planet to planet, but weight changes because g (hence $w=mg$) differs from planet to planet. [!ANSWER] Mass stays constant; …

Mass is an intrinsic property of a body -- the amount of matter it contains -- and remains exactly the same everywhere, on any planet or in deep space, since it does not depend on the local gravitational field at all. Weight, by contrast, is the force of gravity acting on that mass, $w=mg$, and since $g=GM_{planet}/R_{planet}^2$ differs from planet to planet (depending on that planet's own mass and radius), the SAME body has a DIFFERENT weight on each planet, even though its mass never changes. For example, a body weighing a certain amount on Earth would weigh roughly one-sixth as much on the Moon (much …

Distinguish mass (intrinsic, unchanging) from weight (the gravitational force $mg$, which changes …

Using 'mass' and 'weight' interchangeably, or assuming both change together (only …