Name a machine which is used to:

(a) multiply force

(b) multiply speed, and

(c) change the direction of force applied.

State whether the following statements are true or false.

(a) The velocity ratio of a single fixed pulley is always more than 1.

(b) The velocity ratio of a single movable pulley is always 2.

(c) The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2ⁿ.

(d) The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting the load.

Name the pulley which has no gain in mechanical advantage. Explain, why is such a pulley then used?

What is a single movable pulley? What is its mechanical advantage in the ideal case?