Last updated on Oct 23, 2026

Coefficient of Friction - Harder Problems (Edexcel A-Level Mathematics): Quizzes

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Coefficient of Friction - Harder Problems

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For a block on an incline with no other forces, $\mu$ at limiting eqn = ?

$\tan \theta$

Weight component down slope for angle $\theta$ is:

$mg \sin \theta$

Normal reaction for mass $m$ on slope $\theta$ (no other forces):

$mg \cos \theta$

Static friction condition is best stated as:

$F \leq \mu_s R$

Kinetic friction is described by:

$F = \mu_k R$

Horizontal $P$ on incline: component parallel to slope is:

$P \cos \theta$

In the example, $\mu$ for $20°$ incline was approx:

0.364

Normal reaction $R$ for 10 kg on 20° with $g=9.81$ :

≈92.09 N

If block tends to slide down slope, friction acts:

Up the slope

Which friction coefficient to use when object is already moving?

$\mu_k$

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Newton's Second Law

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Newton's Second Law

Further Forces & Newton's Laws

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Newton's Second Law

Further Forces & Newton's Laws

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