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Definition   		 A Branch of Science in which we discuss about Matter , Energy and their mutual relationship

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Everything in the universe have matter and energy.

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Explosion of a cloud of powder of particles of colour white and a black background

Physical quantities are those quantities which can be measured. Physical  quantities are of two types.

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Scalar Physical quantities  		 Those quantities which have magnitude only.   E.g   mass , length , time etc.

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Yellow paper aeroplane flying the opposite way as many grey paper aeroplanes

Vector Physical Quantities 		 Those quantities which have both magnitude and direction.  E.g   Force , Velocity , Current etc.

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Physical quantities can be derived into three categories. Base units  Derived units Supplementary units

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Base units:  	 The SI (System International ) are  the standard units of measurements for measurement of base quantities. 	There are seven base units. Length   Mass Time  Electric current Amount of substance Intensity of light Temperature

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Derived units:   		 	 The units that derived from base units called derived units. E.g    Work  , Force , Velocity , Pressure

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Supplementary units: 	 	Supplementary units are dimensionless units. 	 	These units are purely geometric units. 	There are two supplementary units.  	Radian 	Steradian

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Radian  	The Angle  subtended at the center of the circle by an arc with a length equal to radius of circle

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Steradian:               	  The solid angle of sphere subtended by portion of the surface whose area is equal to square of radius sphere.

PHYSICS

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