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  1. e ≤ fmax
  2. e > fmax
  3. no limit of e can be set
  4. \(e = \frac{{1 - {{\left( {{f_{max}}} \right)}^2}}}{{{f_{max}}}}\)
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1 Answers

Option 1 : e ≤ fmax

Concept:

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Let the weight of vehicle = W in stopping condition the friction force F

should be greater than w sin θ to prevent the sliding F > w sin θ

From Figure,

F = w sinθ 

for a smaller value of θ 

tan θ = e = sin θ

F = w × e ...... (1)

We can also written,

F = w cosθ  × f

F = w × f (As θ is low so Cos θ = 1) .........(2)

From equation 1 & 2

w × f ≥ w × e

f > e

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