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Question

# (a) Define mass of a body. What is the SI unit of mass ? (b) Define weight of a body. What is the SI unit of weight ? (c) What is the relation between mass and weight of a body ?

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Solution

## (a) MASS The total quantity of matter contained in an object is called its mass. It is scalar quantity. It is measured by beam balance. Mass of the object remains constant at all the places. We can measure mass of an object by its inertia. SI unit of mass is ”kg”. (b) The weight of an object is related to the amount of force acting on the object, either due to gravity or to a reaction force that holds it in place Weight = Force SI unit : kg⋅m/sec^2 SI unit: newton (N) (c) W = m * g Mass is the amount of matter a body has. Since W=mg ,So weight is that unit which we get by multiplying mass of a body and gravitional force accquired to displace a body.

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