# Mass Weight Definition

The scientific concept of mass is quite different from that in everyday life. A common man does not distinguish between mass and weight. Weight of a body is the force exerted by earth on the body towards the centre of earth.

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From the below definition we can easily understand the concept of mass and weight and difference between the mass and weight.Relation between weight and mass:Definition:The relation between weight (W) and mass (m) of the body is,W="mg"Where, g denotes the acceleration produced in the body due to earth’s gravity and so it is called acceleration die to gravity.

The weight of a body depends on the location of the body while the mass of a body is same at all places.From the above definition we can easily understand the concept and let, see one example.Example:The weight of a body on moon is of the weight on earth.

The weight of a body in an artificial satellite revolving around the earth is zero. However there is no effect on the mass of body. Mass at each lace remains same (unchanged). If a boy has no mass 50kg, then it weight at moon and different planets will be different, but mass of boy on each planet will remain 50 kg. The below table shows this concept.

Taking g on the earth = 10 m/s2.Here, N denotes the Newton.Definition of Measurement of mass of body:When an external force is applied on a body, the force tends to change the state of motion of the body-either in magnitude or in direction, while the body opposes any change in its state of motion. The property by virtue of which a body resists any modification in the motion of the body is known as inertia. In the language of physics mass is a measure of inertia. Greater is the mass of the body, greater is the inertia.

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If F- force and a the acceleration formed in the body of mass m, thenF="ma" => m = (F)/(a)The mass of body determined in this way is measure of inertia and is called inertial mass of the body. The inertial mass of a bus is adequately higher than that of a cycle, because to produce same acceleration in a bus and a cycle, much larger force is required in the case of a bus.