Physics further turning forces

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Physics revision further-Turning forces

Moments

  • It is the effect of a turning force
  • To increase the moment
    • Increase the size of the force
    • Increase the distance between the point of force exertion and the pivot.
  • The weight being moved is called the load
  • The force being applied is called the effort
  • Moment is worked out using the equation
    • Moment = force x distance form force to pivot.

(Newton metre= Newtons x metres)

Centre of mass

  • The COM is the point were all weight of an object acts from
  • It is the point were all an objects mass may be thought to concentrate.
  • An suspended object will come to rest with it’s COM directly below it’s point of suspension.
    • When it is still this is called equilibrium.
  • To find the COM of a symmetrical object you just find were the lines cross.

Moments in balance

  • For an object to be balanced and stationary then the force of the clockwise and anticlockwise moments must be equal.
    • A good example is a see-saw

Stability           

·        The base is the width of the bottom of the object

·        An object will fall over when it’s COM acts outside it’s base

  •  
    • A good way to visulise the COM acting is to imagaine a line between it and the centre of the earth.
    • So when that line falls outside the base the object will fall over
  • Examples of objects and basses
    • Busses have to be tested to make sure they will not fall over.
    • Tractors have wide bases so they can travel over bumpy land
    • High chairs have to have a wide base so wiggly children will not fall out.

Circular motions

  • For an object moving a circle

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