Question

List two differences between mass and weight. If the mass of a body is 10 Kg. Find its weight on (i) the earth, (ii) the moon (‘g’ on earth is 9.8 ms2 and acceleration due to gravity on the moon is 1/6th of that on the earth)

Answer 1

Following are the difference between mass and weight

1. Mass is the measure of amount of matter in a body or the resistance of a body towards acceleration by a force while weight is the force experienced by a mass kept in a gravitational field.
2. SI unit of mass is kilogram while that of weight is Newton.
3. Mass of a body remains same irrespective of place where it is kept. Weight of a body increases if it is kept in a strong gravitational field and decreases in a weaker one.

...

Mass will be constant and thus will the same on earth and moon.

weight = mg

here,

m = 10kg

on earth -

g = 9.81 m/s²

so,

W_e = 10 x 9.81 = 98.1 kg

and

on moon -

g =1.63 m/s²

so,

W_m = 10 x 1.63 = 16.3 kg