Question

mass of object is 30kg in the earth surface, what will be it in the moon surface?

Answer 1

First and foremost , lets convert the mass into weight .

So the weight of the person would be his

Mass times acceleration due to gravity. This is , 30*10=300newtons

Now the gravitation on moon is around a sixth part of that on earth so , the weight of the person would be 300/6=50 N

Remember not to use mass in such problems since mass is a universal entity and will always be the same in any corner of the universe . Always use the weight or the force as it can be varying at different points in universe .

Always remember to use this equation

Mass of the object * acceleration due to gravity on earth(10m/s2)/gravitation of that planet with respect to that of earth.

Hope it works.