# Mass and Weight of an Object

#### notes

Weight and Mass:

Mass: Mass of an object is the measure of its inertia. It is the matter present in it. It remains the same everywhere in the universe.

Weight: The force of attraction of the earth on the object is known as the weight of the object. Its S.I. unit is Newton.

W = m × g

The weight of an object can change from one place to the other, from one planet to the other.

Weight of an object on moon is given by the formula.

"W"_"m" ="GM"_"m" xx "m"/"R"_"m"^2

Wm= weight of an object on moon

Mm= mass of the moon = 7.36 × 1022

Rm= radius of the moon = 1.74 × 106

G = 6.67 × 10–11 Nm2/kg2

therefore  "W"_"m" = "G" (7.36 xx 10^22"kg"xx"m")/((1.74 xx 10^6"m")^2)

"W"_"m" = 2.431 xx 10^10 "G" xx "m"

"W"_"e" = 1.474 xx 10^11 "G" xx"m"

therefore "W"_"m"/"W"_"e" = ("Weight of object on Moon")/("Weight of object on Earth") = (2.431xx10^10"Gm")/(1.474 xx 10^11"Gm")= 1/6

therefore Weight of an object on moon is 1/6th the weight of an object on the earth.

#### description

• Mass
• Weight
• Weight of an object on the moon
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