Blocks A and B of Fig. have 20- and 50-kg masses, respectively. The static coefficients of friction be- tween blocks A and B and between block B and the hori- zontal surface are 0.25. The static coefficient of friction be- tween the rope and the fixed pegs is 0.20. Determine the force P required to initiate motion of block B. P B
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Given data:
- The mass of the block A is .
- The mass of the block B is .
- The coefficient of static friction between block A and B is .
- The coefficient of static friction between rope and fixed pegs is .
First draw the FBD for block A as:
Now apply the force equilibrium condition along y-direction as:
For impending slipping:
Draw the FBD for block B as:
Now apply the force equilibrium condition along y-direction as:
For impending slipping:
Now apply the force equilibrium condition along x-direction as:
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