# 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