Physical World and Measurement

To Determine the Width of a River

PQ, the width of the river= W

AB, the known distance= x

At 'A '- observe the angles PAQ, QAB

At 'B' - observe the angles ABP and ABQ

Now, in D^le PAB, we know that values of

and AB.

\ AP can be determined.

In D^le QAB, we know the values of and AB.

\ AQ can be determined.

In D^le PAQ, we know the values of AP, AQ and

\ PQ can be determined.

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	Introduction
	What is Physics?
	The Basic Forces in Nature
	Laws of Conservation
	Summary
	Introduction - Systems of Units
	Need of Measurement and System of Units
	Mass
	Abbreviations in Power of 10 (Used in SI units)
	Order of Magnitude
	Introduction - Physical world and Measurement
	Atomic to Astronomical Range of Variation of Length
	Length Measurements
	To Calculate the Radius of Atom by Making Use of Avogadro's Hypothesis
	To Determine Molecular Size
	Determination of Diameter of Moon
	To Determine the Height of an Accessible Electric Pole
	To Determine the Height of an Accessible Tree using a Sextant
	To Determine the Height of an Inaccessible Mountain
	To Determine the Width of a River
	To Measure the Distance of a Submarine (Echo Method)
	Measurement of Mass
	Introduction - Significant Figures
	Significant Figures
	Arithmetic Operations With Significant Figures
	Propagation of Errors
	Summary
	Fundamental and Derived Units
	Dimensional Formulae and Dimensional Equation
	Principle of Homogeneity of Dimensions
	Limitations of Dimensional Analysis
	Four Categories of Physical Quantities
	Advantages of Dimensional Analysis
	Conclusion
Animations
	System of Units - An Activity
	Length Measurements
	Physical Balance (Beam Balance)
	Inertial Balance
	Dimensional Analysis - An Activity

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