<B>MECHANISM</B>

Mechanisms allows objects to move. They transmit and transform force and motion from a motor to a a receptor. They make work easier and more comfortable for human beings.

Linear transmission of motion:

Levers

Class 1	Class 2	Class 3

It has the turning point(fulcrum) between the load and the effort.	It has the load between the fulcrum and the effort	It has the effort between the fulcrum and the load

Have a look the next videos about levers:

what is a lever?

Types of levers:

Pulleys:
The pulley is a simple machine made with a wheel and a rope or chain. There are three types of pulleys:

Fixed pulley: The pulley is balanced when the force we apply F is equal the load R.
Movable pulley: It`s a set of two pulleys, one fixed and another with linear movement
Compound pulley system: a special combination of fixed and movable pulleys.

Examples of pulleys: Elevators, gym equipment, wells, curtains at a theatre, blinds on the windows, the clotheslines, flagpoles to hoist the flag up or to bring it down, cranes, garage doors raise and lower utilising a pulley system, rock climbers use pulleys to help them to climb, timing belt in cars...