The coefficient of static friction between hard rubber and normal street pavement is about 0.90. On how steep a hill (maximum angle) can you leave a car parked?

Question

Nikolai Myers

Physics

7 May, 16:55

The coefficient of static friction between hard rubber and normal street pavement is about 0.90. On how steep a hill (maximum angle) can you leave a car parked?

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Kiley · Answer 1

First thing to do is to draw the system described above. Then, write an equation for the forces present.

Σ F = Fg - Ff

0 = mgsin ∅ - umgcos ∅ 0 = gsin ∅ - ugcos ∅

u = tan ∅

∅ (max) = tan^-1 (u)