AQA Physics [P2] Part 1

Motion
1. Distance-time graphs
  1. Gradient = speed
    1. Steeper gradient
      1. Faster speed
2. Velocity-time graphs
  1. Gradient = acceleration
    1. Steeper gradient
      1. Faster acceleration
  2. Horizontal line
    1. Travelling at steady speed
  3. Area under line
    1. Distance travelled
3. Velocity
  1. Speed in given direction
4. Acceleration
  1. Change of velocity
  2. a = (v-u)/t
Forces
1. Two objects
  1. Always exert equal and opposite forces
2. Resultant force
  1. Zero
    1. Stays at rest of object is at rest
    2. Carry on moving at same speed if object is moving
  2. Causes acceleration
    1. Bigger the force, greater the acceleration
3. On the road
  1. Stopping distance
    1. BD + TD
  2. Thinking distance
    1. Driver
      1. Tired
      2. Alcohol
      3. Drugs
  3. Breaking distance
    1. Increased by
      1. Bad weather
      2. Poorly maintained roads
        Condition of car
        Tyres
        Friction
4. Falling objects
  1. Fluid
    1. Exerts a drag force
      1. Terminal velocity
        Velocity it reaches when it falls
5. Stretching and squashing
  1. Extension
    1. Difference between the length of spring and its original length
  2. Extension directly proportional
  3. Stiffer spring
    1. Greater spring constant
  4. Elastic potential energy stored
    1. When work is done
Energy and Momentum
1. Gravitational potential
  1. Stored
    1. Position in Earth's gravitational field.
2. Kinetic
  1. Greater mass
    1. Faster speed
3. Momentum
  1. Greater mass and velocity
4. Two objects push each other
  1. They move apart with different speeds
    1. Equal and opposite momentum
Current Electricity
1. Electrical charges
  1. Insulating materials
    1. Charge when rubbed
2. Resistance
  1. Potential difference / current
  2. Ammeters always placed in series
    1. Voltmeters always placed in parallel
3. Current-potential graphs
  1. Filament bulb
    1. Curve
  2. Diode
    1. Forward resistance low
  3. Thermistor
    1. Resistance decreases if temp increases
4. Series circuit
  1. Connected one after other
  2. Current same
5. Parallel circuit
  1. Total current = all currents
    1. Bigger resistance, smaller current
      1. I = (V / R)

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AQA Physics [P2] Part 1

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