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# Mass and Weight

Mass: Mass is the basic property of a body. Mass of a body is defined as the quantity of matter contained in the body. Its SI unit is kilogram (kg). Weight: Weight of a body is defined as the gravitational force exerted on it due to the Earthâ€™s gravity alone.

MASS AND WEIGHT

Mass: Mass is the basic property of a body. Mass of a body is defined as the quantity of matter contained in the body. Its SI unit is kilogram (kg).

Weight: Weight of a body is defined as the gravitational force exerted on it due to the Earthâ€™s gravity alone.

Weight = Gravitational Force

mass (m)Ă— acceleration due to gravity(g).

g = acceleration due to gravity for Earth (at sea level) = 9.8 m sâ€“2.

Weight is a vector quantity. Direction of weight is always towards the centre of the Earth. SI unit of weight is newton (N). Weight of a body varies from one place to another place on the Earth since it depends on the acceleration due to gravity of the Earth (g) weight of a body is more at the poles than at the equatorial region.

The value of acceleration due to gravity on the surface of the moon is 1.625 msâ€“2. This is about 0.1654 times the acceleration due to gravity of the Earth. If a person whose mass is 60 kg stands on the surface of Earth, his weight would be 588 N (Wâ€‰=â€‰mg = 60 Ă— 9.8). If the same person goes to the surface of the Moon, he would weigh only 97.5 N (W = 60 1.625). But, his mass remains the same (60 kg) on both the Earth and the Moon.  Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
10th Science : Chapter 1 : Laws of Motion : Mass and Weight |