Friction — Formula Sheet
ICSE · Class 11 · Physics
10 formulas from Friction (ICSE Class 11 Physics) on one page, grouped by topic. Part of the ICSE Class 11 Physics syllabus.
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Formulas and Key Relations
2. Types of Friction and Coefficients
f_s^{max} = μ_s R
μ_s = f_s^{max}/R
f_k = μ_k R
f_r = μ_r · R/r
tanθ_s = μ_s
3. Motion on Rough Surfaces
F = μ_s mg/(cosθ + μ_s sinθ) = mg sinθ_s / cos(θ − θ_s)
F_least = mg sinθ_s = μ_s mg/(1+μ_s^2)^(1/2)
a = g(sinθ − μ_k cosθ)
μ = 2tanθ
Key relations
The coefficient of static friction is the ratio of limiting friction to normal reaction: μ_s = f_s^{max}/R.
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