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Each basic measurable physical property represented by a specific symbol written within square brackets is called dimensions. 	All physical quantities can be derived as combinations of basic dimensions .

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Physical Quantities Dimensions Length   [ L ] Mass   [ M ] Time   [ T ]

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Advantage of dimensional analysis:     To check the homogeneity of equation: 	To check the correctness of equation , we are able to show that dimensions of the quantities of both sides are same. This is called the principle of homogeneity of dimensions.

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Deriving a possible formula: 	 The success of this method for deriving a relation for a physical quantity depends on correct guessing of various factors on which other physical quantities depends.

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Q 2.Derive a relation for the time period of simple pendulum using dimensional analysis. The various possible factors on which the time period T may depends are, Length of pendulum ( l ) Mass of bob ( m ) Angle θ  which the thread makes with vertical Acceleration due to gravity ( g )

Dimensions of Physical Quantities

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