AQA Physics [P2] Part 1

AQA Physics [P2] Part 1

1. Motion

   • Distance-time graphs
     • Gradient = speed
       • Steeper gradient
         • Faster speed
   • Velocity-time graphs
     • Gradient = acceleration
       • Steeper gradient
         • Faster acceleration
     • Horizontal line
       • Travelling at steady speed
     • Area under line
       • Distance travelled
   • Velocity
     • Speed in given direction
   • Acceleration
     • Change of velocity
     • a = (v-u)/t

2. Forces

   • Two objects
     • Always exert equal and opposite forces
   • Resultant force
     • Zero
       • Stays at rest of object is at rest
       • Carry on moving at same speed if object is moving
     • Causes acceleration
       • Bigger the force, greater the acceleration
   • On the road
     • Stopping distance
       • BD + TD
     • Thinking distance
       • Driver
         • Tired
         • Alcohol
         • Drugs
     • Breaking distance
       • Increased by
         • Bad weather
         • Poorly maintained roads
           • Condition of car
             • Tyres
               • Friction
   • Falling objects
     • Fluid
       • Exerts a drag force
         • Terminal velocity
           • Velocity it reaches when it falls
   • Stretching and squashing
     • Extension
       • Difference between the length of spring and its original length
     • Extension directly proportional
     • Stiffer spring
       • Greater spring constant
     • Elastic potential energy stored
       • When work is done

3. Energy and Momentum

   • Gravitational potential
     • Stored
       • Position in Earth's gravitational field.
   • Kinetic
     • Greater mass
       • Faster speed
   • Momentum
     • Greater mass and velocity
   • Two objects push each other
     • They move apart with different speeds
       • Equal and opposite momentum

4. Current Electricity

   • Electrical charges
     • Insulating materials
       • Charge when rubbed
   • Resistance
     • Potential difference / current
     • Ammeters always placed in series
       • Voltmeters always placed in parallel
   • Current-potential graphs
     • Filament bulb
       • Curve
     • Diode
       • Forward resistance low
     • Thermistor
       • Resistance decreases if temp increases
   • Series circuit
     • Connected one after other
     • Current same
   • Parallel circuit
     • Total current = all currents
       • Bigger resistance, smaller current
         • I = (V / R)