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Mechanisms - Coggle Diagram

- - - - A lever is a rigid bar that is supported by a fulcrum.
        
        F is the force or effort applied at one end of the bar
        
        d is the distance from F to the fulcrum
        
        R is the resistance or load which acts at the other end of the bar.
        
        r is the distance from R to the fulcrum
      - Types of levers
        
        There are three types of levers: class l, class 2 and class 3
        
        Class 3 . The effort aplied is between the fulcrum and the resitance
        
        Class 2 . The resistance is between the fulcrum and the effort aplied
        
        Class I . The fulcrum is between the effort applied
        
        Fixed pulley
        
        A fixed pulley is a wheel that has a groove around lt into which a rope,
        cham or belt fits It rotates around an axle that is fixed to an immobile surface
        
        Movable pulley
        
        A moveable pulley is a set of two pulleys — one is fixed while the other
        can move to a linear direction.
        
        Compound pulley
        
        This ss a system of fixed and moveable pulleys, often called block and
        tackle.
  - - - They include friction drives, pulley systems, gears and worm gears.
    - - Friction drives are made up of two or more wheels that are in contact. The first wheel is called the primary drive wheel When it moves, it
        turns or drives the second or output wheel, causing it to move as well.
    - - They consist of two pulleys or wheels that are a certain distance apart
    - - There are two ways in which motion can be transformed: From Rotary to Linear , From rotary to recipocrating .
        
        From rotary into linear
        
        Rack and pinion system
        
        This uses a pinion that is a small cogwheel, mounted on a rack that is a
        toothed belt or bar
        
        From rotary into reciprocating motion
        
        Crank-link-slider
        
        This is composed of a crank and a rod called a connecting rod or link.
        
        The slider produces a reciprocating motion
        
        This rod has articulated joints at each end — one is connected to the
        crank and the other to the slider