When is an elevator a reasonably good inertial reference frame?
A) Never, under any circumstances.
B) Always, since it is attached to the surface of the earth.
C) It is good except when it is changing speed.
D) Other conditions (describe).

Question

Quizplus · Accepted Answer

An elevator acts as a reasonably good inertial reference frame when it is moving at a constant velocity, meaning it is not accelerating or decelerating. This is because, in such a state, the laws of motion inside the elevator are similar to those in a non-accelerating, inertial frame of reference. When the elevator changes speed, it introduces acceleration, making it a non-inertial reference frame where additional fictitious forces appear to act.

When Is an Elevator a Reasonably Good Inertial Reference Frame