Question

6) A 9000 N (-Fr) box being pulled using inclined plane (with h-2m and L-6m, MA1-L/h) and pulley system (with 5 strands Fig a & b below). a) Find the Mechanical advantage of the system (MA-MA1xMA2). b) A wheel & axel were added at the effort side (wheel diameter 1.5ft and axle diameter 0.5 ft). What is the new MA? (MA-MA1XMA2XMA3) Fr c) Compute Fe effort force required? (MA-Fe b)

Answer 1

Since, the rope is continuous, the tension along the entire rope should one and the same. Considering the free-body diagram for the pulley system The weight of load on along the incline to be pulled by rope is, 3000 N The mechanical advantage of the "block and tackle" system is, From the equilibrium of the system, 5T 3000 3000 FF3000 F T 3000 The mechanical advantage of the total system is,