Linear transmission mechanisms area type of simple machine. Examples of linear transmission mechanisms era levers and pulleys.
LEVERS:
A lever is a rigid bar that can pivot on a point of support called a fulcrum. It is used to lift load by applying force to a point on the bar. We call the applied force effort, and the load to be lifted the resistance.
The law of the lever states that:
E · Ae = R · Ar
There are 3 different classes:
Class 1:
The fulcrum is located between the effort and the resistance.
Class 2:
The resistance is located between the effort and the fulcrum.
Class 3:
The effort is located between the resistance and fulcrum.
PULLEYS:
Pulleys are used to lift heavy loads. They are wheels with a grooved rim.
There are 2 types of pulleys:
Fixed:
The axis of rotation of the pulley is fixed by attaching it to a support that prevents if from moving.
With fixed pulleys, we still have to put in the same effort to lift the weight, but they make the task easier.
Moveable:
Move vertically as well as turning when we pull on the rope. These pulleys reduce the effort required to a half.
Systems made up of moveable and fixed pulleys are called hoists. The force needed to lift a load in a hoist is reduced in proportion to the number of moveable pulleys in the system.
Techno/mechanisms 