How to apply gauss's law and its explanation

Student suffers and lot of problem during application of gauss law
Now I am going to explain how you can easily apply this law to different -2
geometry

1:- Choice of gaussian surface
2:- line of force
3:-Area vector  (imagine you are inside that geometry than count number of sides )

Now Lets take a example of cylindrical body
 which is placed horizontally along the electric line of force (electric field)

now if we look at it
-we get three surface
one curved surface 
two circular cross section surface 

Now take the flux from each surface
along curved surface flux will be  zero 

(apply on formula angle will be 90 degree )

and along the cross section surface 

In both section flux will be equal but in opposite direction
so we can conclude that sum of flux along all surface is equal to zero

Electrical flux concept

when ever magnitude or mass is moving from one place to another we can say a flux is moving from one place another .

it can be student flux coming out of coaching .it can be water flux ,magnetic or electrical flux etc

Electrical flux

Positive charge plate treated as source and negative charge plate treated as sink ,
than the
moving things from positive plate to negative plate called electrical flux .

Formula Given below

Q is the net charge enclosed by gaussian surface

Uniform and Non uniform Circular motion

It is the circular motion or movement of an Object in circular path.

Uniform Circular Motion-
if the magnitude of particle velocity is constant or uniform along the circular path then it is called uniform circular motion

Non uniform circular motion-

if the magnitude of  particle velocity is not constant along the circular path then it is called non-uniform circular motion

note-

another type of motion also there when body rotate around itself and also does circular motion that type of motion called spinning motion .

ex-
spinning of planet around the Sun

Centripetal Acceleration -

when a body does circular motion , an acceleration acts on the body whose direction is always toward the centre of the circular path.

another name is Radial acceleration as it acts along the radius of circle
its unit is m/s2
 It is a vector quantity

Centripetal force-

it is a force that compel the body to move in circular path .
it always directed toward its centre .

Important -work done by centripetal force is zero
because both centripetal force and displacement are at right angle to each other

.

Different between the Distance and Displacement

Many student little bit confuse about Distance and Displacement

Let us see define first
Distance- it is total path covered by any body to reach from one point to an other
Distance is a scalar quantity 

Displacement- it is the shortest distance that a body take reach the from one point to another
displacement is a vector quantity 

one question could be raised that
Is distance and Displacement can be equal

a) yes

b) no

Answer - No

because distance is a scaler quantity and displacement is vector quantity 
If we talk about Magnitude only than we can say both may be Equal