Units and Measurement

Physics Part I

Physics

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A book with many printing errors contains four different formulas for the displacement *y *of a particle undergoing a certain periodic motion:

(a = maximum displacement of the particle,*v *= speed of the particle, *T *= time-period

of motion).

Rule out the wrong formulas on dimensional grounds.

(a = maximum displacement of the particle,

of motion).

Rule out the wrong formulas on dimensional grounds.

The displacement y has the dimension of length.

Therefore, the formula for it should also have the dimension of length.

Trigonometric functions are dimensionless and their arguments are also dimensionless.

Based on these considerations now checking each formula dimensionally, we have

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Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.

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What is measurement?

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What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory.

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Define unit.

The quantity used as a standard of measurement is called unit.

Example: Unit of time is second.

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