(a) State the relationship between mechanical advantage, velocity ratio and efficiency.
(b) Name the term that will not change for a machine of a given design.

Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine.

With reference to the term mechanical advantage, velocity ratio and efficiency of a machine, name and define the term that will not change for a machine of a given design.

The correct relationship between mechanical advantage (M.A.) velocity ratio (V.R.) and efficiency (eta) is:

Write a relationship between the mechanical advantage (M. A.) and velocity ratio (V. R.) of an ideal machine.

State one reason why mechanical advantage is less than the velocity ratio for an actual machine.

Explain the term mechanical advantage. State its unit.

A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long. (a) to which class does it belong ? (b) Draw a diagram of the lever showing the position of the fulcrum F and directions of both the load L and effort E. (c) what is the mechanical advantage and velocity ratio if the efficiency is 100%? (d) What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%?

How is mechanical advantage related to velocity ratio for (i) an ideal machine, (ii) a practical machine ?

Draw a diagram of a combination of three movable pulleys and one fixed pulley to lift up a load. In the diagram, show the directions of load, effort and tension in each strand. Find : (i) the mechanical advantage, (ii) the velocity ratio, and (iii) the efficiency of the combination, in the ideal situation.

A pulley system has a velocity ratio of 4 and an efficiency of 90%, calculate: The mechanical advantage of the system.