A block and tackle system with 3 supporting strands is used

A block and tackle system with 3 supporting strands is used to lift a metal lathe in a manufacturing facility. The motor being used to wind the cable in the pulley system can provide 28 lb of force. 1) What is the actual mechanical advantage of the system? 2) What is the maximum weight of the lathe?

Solution

Solution :

a) Mechanical advantage here is nothing but Actual mechanical advantage because of the3 supporting strands.

Hence AMA = 3

b) Maximum weight of lathe is nothing but the force multiplied by number of strands since they are used to lift the metal lathe.

Maximum weight = 28*3 = 84 lb