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Weight and Mass

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Mass(m):
i. Mass is the amount of matter present in the object.
ii. Mass does not change with place.
iii. SI unit is kg. CGS unit is gram (g).
(iv) Mass is a scalar quantity.
Weight (W):
(i). Weight is the force with which the Earth attracts the object.
(ii) Weight (W)`=mg` As g changes W also changes.
(iii) SI unit is newton. CGS unit is dyne.
(iv) Weight is a vector quantity.
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Weight (W)

Assertion : Mass of a body is defined as the gravitational force exerted on it due to earth's gravity alone Reason : "Weight"= "mass" xx" acceleration due to gravity" .

Knowledge Check

  • A body weight 700N on earth. What will be its weight on a planet having 1//7 of earth's mass and half of earth's radius?

    A
    400 N
    B
    300 N
    C
    200 N
    D
    100N
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