The block brake consists of a pin-connected lever and friction block at B. The coefficient of static friction between the wheel and the lever is μs and a torque M is applied to the wheel. Determine if the brake can hold the wheel stationary when the force applied to the lever is?

(a) P1

(b) P2.

Assume that the torque M is applied counter-clockwise.

Given:

μ s = 0.3

M = 5 N ∙ m

a = 50 mm

b = 200 mm

c = 400 mm

r = 150 mm

P1 = 30 N

P2 = 70 N

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