alleryThe ANGLE OF REPOSE φ is related to coefficient of friction by:
Atan φ = μ
Bsin φ = μ
Ccos φ = μ
Dφ = μ
Answer & Solution
Correct answer: A. tan φ = μ
At the angle of repose, a body just starts sliding down an incline.
**Force balance:** mg sin φ = μ mg cos φ → tan φ = μ.
**So φ = tan⁻¹(μ).**
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