A small bob is suspended from the roof of a truck by a light string. The truck accelerates horizontally with acceleration 10 m/s². Take g = 10 m/s². In steady position, the angle made by the string with vertical is:
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Question

A small bob is suspended from the roof of a truck by a light string. The truck accelerates horizontally with acceleration 10 m/s². Take g = 10 m/s². In steady position, the angle made by the string with vertical is:

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G1 Physics · Accepted Answer

In truck frame, pseudo force ma acts horizontally opposite the truck acceleration. The string aligns with resultant effective gravity. tanθ = a/g = 10/10 = 1, hence θ = 45°.