Balanced moments and levers

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Balanced moments and levers
- ballanced moments
  - If the anti clockwise moments are equal to the clockwise moments the object wont turn
  - for a balanced moment the total anticlockwise= total clockwise moments
  - example 1 you younger brother weighs 200n and sits 2 meatures away from the pivot of a seeesaw
    - if you weigh 700n where should you sit to balence the seesaw
      - 300*c=700*y
        600/700 =0.85
        y=0.86m
  - Example 2 a 6m long steel girder weighing 1000n rests horizontally on a pole 1m from one end.
    - what is the tension in a supporting cable attached virtically to the other end
      - the tension in the cable makes it sound harde then it actualy is but the girdes weight is balanced by the tension force in the cable
      - anticlockwise moment (due to weight)= clockwise moment (due to cable tension)
- levers
  - levers use theidea of balanced moments to make it easier for us to do work
  - the moment needed for us to do work= force * distance from the pivot so the amount of force needed to do work depends on the distance the force is applied from the pivot
  - levers increase the distance from the pivot at which the force is applied
    - this means less force is neaded to create the same moment
1000*2=t*5
- anticlockwise moment (due to weight)= clockwise moment (due to cable tension)
- 2000=5T
  - T=400n

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