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Mechanisms, Another picture of cam profiles, I dont really know how to…

- - - - examples
        
        seesaw
  - - - A class 3 is where the fulcrum at one end and the load and effort somewhere else eg any activity
    - - A class two is where the effort is at the front the load in the middle and the fulcrum is at the end example a wheel barrow
    - - A class one has the load at the other end of the fulcrum with the fulcrum in the middle
- - - - what do they do?
        
        Make objects move at the same time
        
        Make objects move parallel to eachother
        
        Change the direction of a force
    - - they are used to make things move in opposite directions
    - - These linkages are used to convert linear motion to rotary motion
- - - - how do they look and work?
        
        They are normally circular with a little change like the top being extended and they work with gravity or springs
- - - - This motion is when objects move in a circular movement eg a wheel and clock hands
    - - this motion is when objects move backwards and forwards in a straight line eg a needle in a sewing matchine
    - - this motion is when objects swing back and forwards eg a childs swing
    - - This motion is a object that moves in a line eg bicycle and drawers
- - - - Lifting heavy loads
        
        They lift heavy loads with rope they half the load so if your lifting somthing that is 4 N you would only need to lift 2 N but for 2 meters
      - Changing directions
      - Changing speed
        
        With changing speed we use a step pully the step pully changes the speed of it with the steps the more steps you use the faster it goes
      - Jock pullys and why we use em
        
        we use jock pullies when the blet is loose and it tightens it to make it work better
- - - - Types of gear
        /
        Important stuff about them
        
        Idler gears
        
        Idler gears is when you want to have 2 gears to rotate in the same direction and keep the same speed
        
        ratio
        
        Raito is the amout of teeth of 2 gears so if you have a gear with 40 teeth (the amout of notches) and a second gear with 20 teeth the ratio is 2:1 so 2 teeth for 1 tooth
        
        Bevel gears
        
        Bevel gears are when two 45 bevel gears are mashed together with the motion being made with both of them at 90 degres
        
        Worm gear
        
        motion can be chainged through 90 using a worm gear
        
        .
        
        Rack and pinion
        
        this is used to change rotary motion to linear motion using a rack and pinion