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| Measurement of Mass |
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| Inertial mass |
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| It is the mass of a body measured, when it is in translatory motion, by the application of external force other than gravity. |
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 where
a1 and a2 are accelerations of bodies of masses m1
and m2 respectively. Inertial balance is used to measure inertial
mass of the body. |
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| It is the mass of a body measured when it is not in motion under the effect of gravity. It is measured using a physical balance. |
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| Though the inertial mass and gravitational mass appear to be different, in actual practice they are treated as same, since the difference between them is found to be negligible and thus, 'mass' of a body is expressed as per the unit of measurement. |
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| Mass is measured using a physical balance that is based on levers and used for measuring mass of small objects. Weight of a body is due to the gravitation pull, W = mg, where m the mass and g the gravitational constant. Spring balance is used for measuring weight [diameter of the physical balance to be given with their measuring parts identified and as understood in earlier classes or studies]. |
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