The moon having less mass than the earth is why a person won't weigh as
much on the moon as on Earth.
This is the attraction that the earth exerts on an object or vice versa. Moon
has a smaller mass when compared to the Earth and therefore has lesser
gravitational pull.
Thus is the reason why a person won't weigh as much on the moon as on
Earth.
Read more about Gravitational pull here https://brainly.com/question/965964