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OSWAAL CBSE Chapterwise Mind Maps, , Class - XI

Mind map : learning made simple

Chapter - 1

P h y s i c s E x c i t e m e n t o f S c o p e a n d

Physical World

Fundamental Forces of Nature

Study of the basic laws of nature

and manifestation in different natural phenomenon

Technology gives rise to new physics; similarly

physics gives rise to new technologies.

Any subject is said to be science when

it is studied in sequence pattern. The experimenting, exploring and predicting

from what we see around us.Systematic observations, controlled experiments, qualitative and quantitativereasoning, mathematical modelling, prediction and verification or falsification of theories.

To explain diverse physical phenomena

in terms of concepts and laws.

To derive the properties of bigger and more

complex system from the properties of its constituent into simpler parts.

Principal Thrust

Classical Physics deals with macroscopic

phenomenon and includes subject like

Mechanics, Electrodynamics, Optics and

Thermodynamics. Quantum Physics deals with

microscopic phenomena at the minute scales of atoms, molecules and nucleus.

Force of mutual attraction between any two

objects by virtue of their masses

Plays a key role in large scale.

The phenomena of the universe, such as

formation of and evolution of stars, galaxies and galactic clusters are by gravitational force governed. Very short range, strongest force Attractive in nature Range - 10 -15 m

Strongest among all fundamental forces.

Very short range (10

m ) weak force

Not weak as gravitational force but much

weaker than the strong nuclear force and electromagnetic forces. -16

Force between the charged particles

Both attractive and repulsive

It is 10

36
times stronger than gravitational force between two protons, for any fixed distance.

OSWAAL CBSE Chapterwise Mind Maps, , Class - XI

2

Mind map : learning made simple

Chapter - 2

P r o p e r t i e s S y s t e m o f u n i t s r a i s e d t o t h e p o w e r M e a s u r e d q u a n t i t y Fu n d a m e n t a l U n i t s

Units and

Measurement

s

Comparison with a certain

internationally accepted reference standard is called unit

Reference standard use to

measure physical quantities. Unit

Limit of resolution of

quantity measured.

Closeness of the measured

value to the true value

Error = True Value - Measured Value

Measurement

Multiplication

or Division ZAB ZAB ZABC pqrZABC If

TypesTypes

mean mean a a 12n mean aa...aa n mean mean a įa 1 0 0 a

Expression which shows how and which of the

base quantities represent the dimensions of a physical quantity is called dimension formula. e.g:- Force =

Mass, length, time, temperature,

electric current, luminous intensity and amount of substance have fundamental units. Kilogram, metre, second, Kelvin, ampere, candela and mol respectively.

Derived units

The units which are derived from

fundamental units are called derived units.

Physical quantities like speed

acceleration have derived units like m/s, m/s 2

Quantities plane angle and

solid angle have radian and steradian as units

Universal acceptance

Non-perishable

Well defined

Does not change with time

Set of fundamental and derived units

CGS - Centimeter, Gram, Second

FPS - Foot, Pound, Second

MKS- Metre, Kilogram, Second

S.I - System International

(Internationally accepted

Combination of Errorsin

All non-zero digits

All zero between two non-zero digits

If the number is less than 1, the zero(s)

on the right of decimal point but to the left of the non-digit zero are not significant.

Terminal or trailing zero (s) in a number

without a decimal point are not significant e.g In 020342.010

Here 20342.01 are significant

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