Physics 3.2

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  • Physics 3.2
    • moments
      • moment = force x distance
      • units= Nm
      • the turning effect when a force acts on something which has a pivot point
      • increase by
        • increase in lever length
      • equal moments = balanced object
    • centre of mass
      • point at which it's mass is concentrated
      • how to find
        • lines of symmetry
        • when hung from a point the object will be in equilibrium
        • using plumbline
      • equilibrium
        • centre of mass directly underneath point of suspention
    • stability
      • increased when
        • larger base
        • lower centre of mass
      • topple when
        • centre of mass outside base
    • hydraulics
      • pressure
        • force acting per unit area
        • = force/area
        • pascals
      • fluid
        • particles are free to flow past each other
        • causes pressure to be exerted on surroundings
      • pressure in a fluid
        • acts equally in all directions
      • liquids cannot be compressed
    • circular motion
      • velocity in a cirlce
        • constantly changing
      • centripetal acceleration
        • acceleration towards the centre of the cirlce
      • centripetal force
        • causes change in direction of motion
        • depends on mass, speed and radiusof circle
        • force that acts towards the centre of the cirlce
    • pendulums
      • T=1/f
      • frequency of oscillations
        • number of complete cycles of oscillations per sec
        • Hz
      • greater frequency
        • shorter oscillation time
      • longer length
        • longer time period

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