Mechanics

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  • Created by: wewewee
  • Created on: 01-04-15 09:24
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  • Mechanics
    • Equilibrium
      • Scalar - physical quantity
      • Vector - direction + magnitiude
      • tan=sin/cos
      • sin^2+cos^2=1
      • Moments
        • Principle of Moments
          • sum of clockwise = sum of anticlockwise
        • moment about a point is F x perpendicular d from the line of action
        • Couples
          • A pair of equal and opposite forces not acting along the same line
    • Moving
      • circular v = 2pi r/T
      • d-t graph
        • gradient = speed
      • v-t graph
        • gradient = acceleration
        • Area under = distance
      • Free Fall
        • s=1/2at^2 +ut y=mx +c
        • 2x grad = acceleration
        • x=t^2   y=s
    • Forces
      • 1st law: stay at rest or constant unless Force
      • T=mg+ma
      • Stopping d
        • think + brake
        • alcohol,mobil ice,tyres
      • safety
        • F=change KE /impact distan
        • bumper=low v crumple zone,  airbags
        • seat belt, collapsible wheel
    • Work
      • area/work=   1/2FL
      • P=Fv
      • 1/2mv^2= mgh
      • P=E(W)/t
      • area/work= Fd

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