Physics Paper 2 - Forces - AQA

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  • Forces - Paper 2 GCSE Physics (AQA)
    • Contact and Non-Contact Forces
      • Vectors have Magnitude and Direction
        • A Vector is something like: Force, Velocity, Displacement, acceleration, momentum etc...
      • Scalar have Magnitude but no Direction
      • Contact and Non-Contact Forces are pretty self explanatory
        • Something physical such as Friction, Air resistance, tension etc are all Contact
        • Something non-physical or not touching such as magnetism, gravity, electrostatic forces. Are all Non-Contact
    • Weight, Mass and Gravity
      • Gravity attracts all masses. This gives everything a weight.Untitled
        • Weight =
          • Mass x
            • Gravitational Field Strength
        • Weight is measured in Newtons
        • Mass is measured in Kilograms
        • GFS is measured in N/Kg
      • Mass is the amount of 'stuff' something has
    • Resultant Force and Work Done.
      • Free Body Diagrams show all the forces acting on an object
        • For example, a skydiver will have his weight pulling him down and air resistance acting in the opposite direction
      • A resultant force is the Overall Force on a Point or Object
        • When a force moves an object through  a distance, ENERGY IS TRANSFERRED and WORK IS DONE
    • Elasticity and Springs
      • F=KE
        • Force(N) = constant(N/m) x extension (m)
      • 1/2 KE^2
        • 0.5 x Constant x Extension (SQUARED)
      • An object is inelastically de-formed if it does not return to its original shape
    • Moments and Newton's Laws
      • M = FD
        • Moment (Nm) = Force (N) x Distance(m)
      • Levers make it easier for us to do work
        • Levers increase the distance from the pivot at which the force is applied
        • Gears however transmit rotational Effects
        • The gears have teeth which interlock and turn eachother
          • Gears however transmit rotational Effects
      • Newton's Laws (MEMORISE)
        • NEWTON'S FIRST LAW
          • If the force on an object is zero than the object will remain at the same velocity
        • NEWTON'S SECOND LAW
          • F = ma
            • Force(N) = Mass(Kg) x acceleration(m/s^2)
        • NEWTON'S THIRD LAW
          • Every action has an equal and opposite reaction
    • Pressure and Density
      • P = F/A
        • Pressure(Pascal's) = Force(N) / Area(m^2)
      • D = M/V
      • Density is the 'compactness' of a substance
    • Distance, Speed and Velocity
      • a= change in v/t
        • Acceleration = Change in Velocity / Time
      • v^2 - u^2 = 2as
      • You can show a vehicles journey on a distance-time graph where positive gradient is acceleration
      • Terminal Velocity is the maximum velocity an object can face when falling from a certain height
        • It occurs when an objects weight and air resistance are equal
      • P=mv
        • Momentum = mass x velocity
        • F= m(change)v / (CHANGE) t

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