A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied in an ideal situation.

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

(a) Mark in the diagram the direction of load L and effort E.

(b) If the load is raised by 1 m, through what distance will the effort move?

(c) State the number of strands of tackle supporting the load.

(d) What is the mechanical advantage of the system?

A pulley system has a velocity ratio 3. Draw a diagram showing the point of application and direction of load (L), effort (E) and tension (T).

It lifts a load of 150 N by an effort of 60 N.

Calculate its mechanical advantage.

Is the pulley system ideal? Give reason.

In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf.

Find —

(i) the mechanical advantage,

(ii) the velocity ratio, and

(iii) the efficiency.