Question

Which part of the gravitational force is worked on mood than the earth?

Answer 1

Same reason we face space when we look up the only part gravity plays is in the direction of “up”.

Are you thinking, why not just go directly to the Moon? Well, that would be expensive: the Moon is a moving target, and gravitating objects like to go along curved paths (you must have noticed), so it is cheaper and easier to just travel by changing orbits