What is the pull of gravity on the moon as compared to earth?

Answer 1

The mass of a 20 kg object is the same anywhere in the universe. That's its mass. Changing the gravity in which the mass is placed won't change the mass itself.

If you are interested in the weight, the 20 kg weight of the object on earth will show up as a 3.3 kg weight on the moon. (Kilogram can be used to measure both mass and weight)

edit 1: 'Mass' and 'weight' are different. Weight (w) is equal to the mass (m) of an object multiplied by the gravitational pull (g) exerted on that object; ie: w=mg

Mass looks at how 'heavy' something is without taking gravity into consideration

Answer 2

According to Newton's Third Law of Motion, the Law of Action and Reaction, if the Earth exerts a force on the Moon, the Moon must exert an equal and opposite force on the Earth.

Newton's Law of Gravity implies the same thing, as its mathematical formula,

F = G m M / r2,

in which F is the gravitational force between the two bodies, m and M are their masses, and r is the distance between them, yields the same value regardless of which object is thought of as pulling on the other.

m is the mass of Moon = 7.35 *1022 kg

M is the mass of Earth = 5.97*1024 kg

r is the distance between moon and earth: 384,000,000 meters

G is the gravitational constant, used in calculation of the gravitational attraction between objects with mass = 6.67 × 10-11 m3/kgs2.

Therefore, F is 1.985 x 1020 Newtons of attractive force between the Earth and the Moon.

In other words, both Laws say that the force the Earth exerts on the Moon is numerically identical to the force the Moon exerts on the Earth.

The only difference is that the Moon pulls the Earth toward the Moon, while the Earth pulls the Moon toward the Earth -- that is, the force on each object is toward the other object, and therefore in the opposite direction.

Answer 3

The weight of any object on the surface of the moon

is 16.55% of its weight on the surface of the Earth.