Chapter 11 of 2363 min read

Friction: static, kinetic, rolling

Why this is asked: Static friction isn't a fixed value — it self-adjusts to match the applied force up to its maximum, μsN — so the friction on a stationary block usually equals the applied force, not μsN itself.

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Test yourself

•There are two inclined surfaces of equal length $L$ and the same angle of inclination $45^\circ$ with the horizontal. One of them is rough and the other is perfectly smooth. A given body takes 2 times as much time to slide down the rough surface as the smooth surface. The coefficient of kinetic friction ( $\mu_k$ ) between the object and the rough surface is close to:

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