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MECHANISMS (Rotary motion mechanisms (Friction drives (the ratio between…

- - - - F: is the force or effort
      - r: is the distance from R to the fulcrum
      - d: is the distance from F to the fulcrum
      - R: is the resistence or load
    - - Class 1
      - Class 2
      - Class 3
  - - - A fixed pulley is balanced when the effort F is equal to the resistance of the load, R: F=R
    - - A movable pulley is balanced when it satisfies this equation F=R/2
    - - This is a system of fixed and moveable pulleys, often called block and tackle
- - - - this consists of a bolt or a threaded bar and a nut that has the same interior diametres as the diametre of the bolt
    - - this consists of a drum that rotates and a crank handle that allows to pull or lift objects
    - - this use a pinon thatis a smallcogwheel,mounted on a rack that is a toothed belt or bar
  - - - this is a set of connecting rods attached to a jointed axle. Each of the joints of the axle act as a crank
    - - this is basically a rotating object that pushes a follower as it moves
    - - this is composed of a crank and a rod called a connecting rod or link. This rod has articulated joints at each end- one is connected to crank and other to the slider
    - - this conists of a wheel with an off-centre rotation axle that doesnt coincide withe the centre of its circumference