[NorthMountain]

The weight of the Moon is the gravitational force exerted on it by some other object. For the sake of simplicity in interpreting the question, I’ll ‘assume’ that the other object is Earth. That gravitational force is obviously NOT zero.

[central_va]

Here is some help if yu want to try this at home:

Orbit equations

[ShadowAce]

Never assume. That wasn’t part of the question. My reference point could be the Horsehead Nebula.