Engineering Entrance
,
JEE Main
,
JEE Advanced
,
Physics
PSEUDO FORCE
If a body is at rest or in uniform motion in a straight line it will continue to do so unless compelled by an external unbalanced force.
==> The above statement is valid only when you observe from non-accelerated frames.
==> If you observe the motion from earth , the above statement is valid at earth , so at earth above statement is known as NEWTON single quotes FIRST LAW.
==> Mean above statement is a definition of frame in which law of Inertia is valid and these frames are known as Inertial frames (Non accelerated Frames)
==> Means If we are not observing the motion from inertial frame ,above statement will not valid.
==> Such a frames are known as Non Inertial Frames (Accelerated Frame)
==> Actually Newton Wanted to apply the above Condition (Give in the Statement) ,So he gives the concept of PSEUDO FORCE.
==> First of all you must know that PSEUDO FORCE is a Imaginary force ,it is not a real force (Like ,Gravitational force ,Electromagnetic force ).
==> We will understand PSEUDO FORCE through an .....
PSEUDO FORCE EXAMPLE:
==> We have two observers A and B and two boxes A and B .Person B and box B are on Platform (at rest ) and Person A and Box A are in the train (At rest with respect to train).
==> Train is moving towards right with constant acceleration .
==> Now we will observe Boxes A and B from two frames (train and Platform)
You can observe that from trainsinglequotes frame 
is not valid(Quantitative relation between 
and 
, as said in NEWTONsinglequoteS first law).
=> Note
You must know that Real Force on box A in the horizontal direction is static friction (fs) and 
is acceleration of train .
=> Newton introduced PSEUDO force so that one could apply 
, even from accelerated frames(Non Inertial Frames)
=> SEE HOW :
If person A observe Box A...........
, From expression (1)
Note:
(-) Sign shows that 
is towards left.
==> Now you can observe PSEUDO FORCE when person (A) observe box (B)
In this way we can understand How to apply PSEUDO force.
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