Question

In following figure, draw a tackle to lift the load by applying the force in the downward direction.

1. Mark in the diagram the direction of load L and effort E.
2. If the load is raised by 1 m, through what distance will the effort move?
3. State how many strands of tackle are supporting the load?
4. What is the mechanical advantage of the system?

Answer 1

1. The load and effort direction are shown in the figure.
   

2. If the weight travels a distance d in a block and tackle, the effort travels a distance nd. 
   Where n is the number of pulleys.
   ∵ Each string is shortened by a length d i.e. d_L = d then d_E = 1m
   ∴Effort will move through = 5 × 1 = 5m

3. Five strands are supporting the load.
4. M.A. of system = `"Load"/"Efffort"`
   = `(nT)/T`
   = n = 5