Question

1. Find the weight in newton of an iron block of mass 30 kg on (i) Earth (ii) Moon. Take 1 kgf = 10 N. [Ans.: (i) 300 N (1) 50 N]​

Answer 1

Answer:

Acceleration due to gravity on the moon is 1/6 times as that on the earth and we know that mass is property of the material it always remains same and weight is measure of gravitational force, hence

mass of object on moon is 60kg and weight =60g/6=10×10=100N

Answer 2

Answer:

Given, mass, m = 30 kg

Acceleration due to gravity on moon, gm = (1/6)g = 10/6 = 5/3 m/s2

Acceleration due to gravity on planet, gp = 3g = 30 m/s2

Now,

Weight on moon = mgm = (30)(5/3) = 50 N

Weight on planet = mgp = (30)(30) = 900 N