All Problems

The Fundamental Equation of Dynamics

Problem 1.62

A small body was launched up an inclined plane set at an angle α=15∘\alpha=15^{\circ} against the horizontal. Find the coefficient of friction, if the time of the ascent of the body is η=2.0\eta=2.0 times less than the time of its descent.

Reveal Answer
k=[(η2−1)/(η2+1)]tan⁡α=0.16k=\left[\left(\eta^{2}-1\right) /\left(\eta^{2}+1\right)\right] \tan \alpha=0.16
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