Question

What is the mass and weight of a body on the moon's surface if it weighs 120 N on the earth's surface

Answer 1

weight on the surface of moon is 20N
and since mass is constant than its mass will be 12.24 kg

Answer 2

Things to consider, Mass is the measure of the matter in a body while weight is the force in which which the earth attracts the body towards it self.

1)  Mass remains the same everywhere. It will be same on the moon as well.

2) If the weight of a body on the earth is 120 N then on the moon it will be:-

1 Kg = 9.81 Newtons

then

Weight = 120 N = 12.232 Kg

According to Newtons Second Law

F=ma , and in this case Acceleration=Gravitational Force e.g a=g

Measuring weight on Earth:-

Weight on Earth = W=mg=12.32

Mass on Earth = m=12.32/10= 1.232 Kg

Mass on Moon Will be same = 1.232 Kg

Gravity on Moon = 1.62

Measuring weight on Moon:-

Weight on Moon= F=mg= 1.232 x 1.62 = 1.995 Kg (2.0 Kg Approximately)

Kilogram is a unit of Mass  and Newton is a unit of  Force.

Which reveals that the weight on moon is 16 % to that of weight on earth.