Mechanics

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  • Created by: Alex
  • Created on: 23-02-14 09:57
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  • Mechanics
    • Constant Acceleration Equations
      • SUVAT
        • v = u + at
        • s = ut + 1/2 at^2
        • s = 1/2 (u + v)t
        • v^2 = u^2 + 2as
        • s = vt - 1/2 at^2
      • Acceleration due to gravity is when a = g
        • g = 9.8 m/s^2
        • up? a = g      down a = -g
    • Motion Graphs
      • Displacement Time
        • Gradient = velocity
        • the maximum displacement is the highest point on the graph.
      • Velocity Time
        • Area = Distance
        • Gradient = Acceleration
    • Displacement, Velocity and Acceleration
      • displacement  --> velocity --> acceleration    differentiate!
      • Acceleration --> velocity --> displacement integrate!
    • Vectors
      • vectors have magnitude and direction, scalars only have size.
      • scalars
        • speed, distance
      • velocity, displacement, accceleration and force.
      • the length of the arrow shows the magnitude of the vectore
    • Forces and Modelling
      • weight = mg
      • Reaction is 90 degrees to the surface
      • Friction opposes motion
      • Tension opposes weight
      • The 'model' is the forces diagram
    • Forces and Vectors
      • forces have components
        • Horisontal = Fcos*
        • Vertical = Fsin*
      • R^2 = a^2 + b^2
    • Friction
      • F is less than or equal to the fristion force.
      • Limiting friction is when F = mew R
    • Newtons Laws
      • A body will stay at rest unless a resultant force acts on it.
      • The overall resultant force is equal to mass x acceleration
      • For each force has an equal and oposite reaction force
    • Friction and inclined planees
      • Use F = ma in 2 directions in inclined plane questions.
      • Resolve forces parallel and perpendicular
    • Connected Particles
      • Think friction!
    • Momentum
      • Momentum = mass x velocity
      • Ft = mv - mu
      • momentum before = momentum after
      • Masses joined together have the same velocity

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