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PHYSICS, 1. Units, and Measurements, * Unit- Tbe Standaod used for the measurement, of, that, physical quantitu is called the unit of, quantity., a, Ex Length of good =5m, Here, m is unit of length., * Systems of units-, ) CG.S system : (sentimetre Gram Second System), Th this, mass is measured in ayam, in second, system, length is measured in cm, and time is measuned, 2) M.K•S ), In this, mass is measured in kilogram and #me is measured, in second,, 3) F.RS System :, System : (Metre ķilogram second system, System, length is measured in metre,, C foot found second system), Systom, Jength is measured in foot,, is measured in pound, in secomd., System: C System International), been internationaly accepted and, Th this, mass, and time is, measured, ム) Sは, It has, is being used, * Fundamental quantities and units:-, all, oVer the worold., The, on any other, called fundamentat, The units yged to, physical quantities which do not depend, Physical quantities for their measuoements, quantiftes-, are, measure Fundamental, Thantities, called fundamental units, are, these, seven fundamestal quantiies,

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2), Fundamental qquantity, Symbol, SI unit, metse, Length, kilogrem, kg, 2., Mass, Time, Second, 4., Temperature, kelvin, K, 5, Electyic curent, ampere, A, Luminous Intensity, Candela, 6, A mount of Substance, mole, mol, Supplementany fundamental, physical quanties., Plane angle, Tad, Vadian, Solid angle, Steradian, ST, Definations, O Plane angle do) -, The satio of, circle to the Jadius of the circle is called, length of an, arc of a, plane angle do), Explanation-, D Let, do is angle subtended, at the centre of, the, arc, ds, the circle., Continue >

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Derived quantities -, The physical uantities which depends on, fundamental quantities fo their measure mosts, are called derived, quantities, The quantities, otheo than fundamenta, called deived quantities, quantities, Derived units, The, are, of derived, units, dexived units., quantities, are called, of derived quantities and their, units, Some, examples, Denived, quantity, formula, Sす Unit | C4S, uhit, no., Velocity, displacement, time, Cm/s, Acceleration, Velocity, time, em/s?, 3., Momentum, masex volocito kg m/s, g cm/s, Mags, Volume, * Conventions, for, use of SI Units-, the, D Unit of y physical quantity showd be, represested by its symbol, every, shoula be, Ex-, m, S, etc, D Full name of a unit wten in smalles, letter, always, Example- newton:, jonle, Newton, Janle, i) only unit followed, be wnitten in copital letterr, Ex -, name, of persoy Should