Q147 / 180 · AIIMS 2004 · Physics

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

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • Correct answer
    C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

If one takes two frames with origin $O_1$ and $O_2$ and if a body $P$ is at rest, both according to $O_1$ as well as $O_2$. The body is at rest. If the frame is moving with a constant velocity, the same observation will not be made. Therefore a frame moving with a constant velocity cannot be taken as an inertial frame. Assertion is right. But the reason given is wrong because the frame on which Newton's laws of motion are applicable is an inertial frame.

Hence, the correct answer is option: 'C'.

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