Draw a diagram to show a block and and tackle pulley system having a velocity ratio of 3 marking the direction of load (L),

Question

(i) Draw a diagram to show a block and and tackle pulley system having a velocity ratio of 3 marking the direction of load (L), effort (E) and tension (T).

(ii) The pulley system drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage.

(iii) Is the above pulley system an ideal machine or not?

Answer 1

(i) Pulley system diagram is shown in figure. Labelled tension T, load L and effort E.

(ii) The mechanical advantage of pulley system is given by load/effort 

Given load L = 150 N, Effort E = 60 N →Mechanical Advantage = L/E = 150/60 = 2.5

(iii) The above pulley system is not an ideal machine because there must be some friction.