In non inertial frame, the second law of motion is written as where For is pseudo force while a is the acceleration of the body relative to non inertial frame.). (1) F=ma. (2) F=ma+Fp. (3)F=ma-Fp. (4) F=2ma

Q. Assertion :A concept of pseudo forces is valid both for inertial as well as non-inertial frame of reference. Reason: A frame accelerated with respect to an inertial frame is a non-inertial frame.

Q. Assertion :Two frames $S_1$ and $S_2$ are non-inertial. Then frame $S_1$ when observed from $S_2$ is inertial. Reason: A frame in motion is not necessarily a non-inertial frame.

Q.

Centripetal force is present in both inertial and non inertial frame of reference then how centrifugal force is only present in non inertial frame of reference, it simply means that it is absent in inertial frame of reference , is it true?

Q. Assertion :The driver in a vehicle moving with a constant speed on a straight road is a non-inertial frame of reference. Reason: A reference frame in which Newton's laws of motion are applicable is non-inertial.

Q. A particle is found to be at rest when seen from a frame S₁ and moving with constant velocity when seen from another frame S₂. Mark out the possible options.
(a) Both the frames are inertial.
(b) Both the frames are non-inertial.
(c) S₁ is inertial and S₂ is non-inertial.
(d) S₁ is non-inertial and S₂ is inertial