In an orthogonal cutting process the tool used has rake

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In an orthogonal cutting process the tool used has rake angle of zero degree. The measured cutting force and thrust force are 500 N and 250 N, respectively. The coefficient of friction between the tool and the chip is

1. 0.7
2. 0.6
3. 0.5
4. 0.9

Correct Option: C

Because the rake angle is zero,
F = Friction force = F_c = Cutting force = 500 N,
N = normal to friction force = F_t = thrust force = 250 N,
Coefficient of friction = F/N = 250/500 = 0.5