Name a machine which is responsible for changing the point of application of force.
Name a machine for each of the following use :
(a) to multiply the force,
(b) to change the point of application of force,
(c) to change the direction of force,
(d) to obtain the gain in speed.
Name a machine which is used to change the direction of the force.
A machine that has a mechanical Advantage of 9 is used for a load of 765 Kgf. Find the required effort.