Question

how gravity in the moonand what is gravitation

Answer 1

Gravity, also called gravitation, is a force that exists among all material objects in the universe. For any two objects or particles having nonzero mass, the force of gravity tends to attract them toward each other. ... Every object in the universe is surrounded by agravitational field.
The moon is 1/4 the size of Earth, so themoon's gravity is much less than the earth'sgravity, 83.3% (or 5/6) less to be exact. Finally, "weight" is a measure of the gravitational pull between two objects. So of course you would weigh much less on the moon.