Blocks A and B of masses 14 k and 18 kg, respectively, are connected by a rope,

Question

Blocks A and B of masses 14 k and 18 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown. The horizontal surface is rough, The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. The system accelerates when forces P and Q are equal to zero. The frictional force on block B is closest to:

Please show all calculations...

Blocks A and B of masses 14 k and 18 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown. The horizontal surface is rough, The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. The system accelerates when forces P and Q are equal to zero. The frictional force on block B is closest to: Please show all calculations...

Explanation / Answer

Before B starts moving, friction = µs*N = µs*mB*g = 0.4*18*9.8 After B starts moving, friction = µk*N = µk*mB*g = 0.2*18*9.8

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