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Combining friction with equilibrium lets you analyse a particle on the point of sliding — often on a rough inclined plane. The limiting friction F = μR closes the system of equations.
What you'll be able to do
For a particle in limiting equilibrium on a rough slope: resolve perpendicular to find , then up the slope friction balances , with at the point of slipping.
Tip — On the point of sliding down a slope, μ = tan θ where θ is the slope angle.
Formula recap
Common mistakes to avoid
Key takeaways
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