Question : If a man has a mass 50 kg on the earth, then what is his weight?

 Question : If a man has a mass 50 kg on the earth, then what is his weight?

Answer:

Weight (w) = mg

Mass of a man = 50 kg

His weight = 50 × 9.8

w = 490 newton

Mass (m) is the quantity of matter contained in a body. Weight (w) is the normal

force (N) exerted by the surface on the body to balance against gravitational pull on the

object. In the case of spring scale, the tension in the spring balances the gravitational pull

on the object. When a man is standing on the surface of the earth or floor, the surface exerts

a normal force on the body which is equivalent to gravitational force. The gravitational force

acting on the object is given by ‘mg’. Here, m is mass of the object and ‘g’ is acceleration due

to gravity.

Values of gravity in SI: 9.806 ms power of  ^-2