Question

What is the difference between an inertial and non inertial frames? And how to identify something that is not accelerating through the trick?What is the difference between an inertial and non inertial frames? And how to identify something that is not accelerating through the trick?

Answer 1

Inertial frame of reference The frame of reference in which Newton's law hold are called inertial frames. Inertial frame are necessarily unaccelerated frames.

In other words frame of references that are either stationary relative to each other or in uniform motion are said to be inertial frame of reference provided that one of these frame is inertial.

Non inertial frame of referenc: The frame of reference in which Newton's law are not applicable are said to be non Inertial frame of reference. All accelerated and rotating frames are non Inertial.

If any body have uniform motion that means velocity is not changing and remains constant it may be zero also through out the journey then body is said to be not accelerating. By trick it may be understand as when a car starts to move or it increases it's velocity we get backward turn when velocity become constant or car is not accelerating we feel no turn when it stops or decrease it's speed we get forward bending.