A plumb line is suspended from a ceiling of a car moving wi…

Physics Newton's Laws of Motion Second Law of Motion Single Correct MCQ

Published on: September 12, 2026

A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of a . What will be the angle of inclination with vertical

\(\tan^{-1}(a/g)\)

\(\tan^{-1}(g/a)\)

\(\cos^{-1}(a/g)\)

\(\cos^{-1}(g/a)\)

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The correct answer is:

When car moves towards right with acceleration a then due to pseudo force the plumb line will tilt in backward direction making an angle \(\theta\) with vertical.

From the figure,

\(\tan \theta = a / g\)

\(\theta = \tan^{-1} \left( \frac{a}{g} \right)\)

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