# AQA Additional Science P2 Notes

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Contents
Unit 1: Motion
Unit 2: Speeding Up and Slowing Down
Unit 3: Work and Energy
Unit 4: Static Electricity
Unit 5: Current Electricity
Unit 6: Mains Electricity
Unit 7: Nuclear Physics

[This is Unit 2 Physics, Additional Physics. This section comes after Core Physics in an AQA Course
(Unit…

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This formula can be rearranged to show either of the following formulae which we use to work out
distance or time:

Generally, speed is measured in metres per second (m/s).

Velocity is speed in a given direction. This means that if a moving object changes direction, its
velocity changes even…

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P2-2 : Speeding Up and Slowing Down
Equal and Opposite Forces
We measure forces in newtons, N. Objects always exert equal and opposite forces on each other.
For example, if object A exerted a force upon object B, object B would exert an opposite force of the
same power on…

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If the object is on the Earth, not falling, we use:

weight (N) = mass (kg) x gravitational field strength (N/kg)

When an object falls through a fluid (i.e. a liquid or a gas, e.g. air), the fluid exerts opposite forces on
the falling object reducing its motion, for example…

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firing a gun: as you fire, the bullet moves out with a momentum in one direction, and the gun recoils
in the opposite direction with equal movement.

When a force acts on a moving object (or an object which is able to move), its momentum changes.
The equation below describes…

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The bigger the charge on an isolated object, the higher the potential difference between the object
and the earth. If the potential difference becomes high enough, a spark may jump across the gap
between the object and any earthed conductor brought near it [a metal object is earthed by
connecting…

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The symbols shown relate to their descriptions below. We use these symbols to make circuit
diagrams to show how components are connected to make a circuit.

A cell is necessary to push electrons around a completed circuit
A battery consists of two or more cells joined together, increasing the "power…

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The current through a diode can only flow in one direction ­ in the reverse direction, the resistance
is so high that the current is zero.

The resistance on an LDR (light-dependent resistor) decreases as the light falling on it gets brighter.

As the temperature of a thermistor, however, goes…

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Series circuit: the current of the bulbs will have the exact same
current flowing through them, e.g. 8 amps. If they all have the same
resistance, they will all share the same potential difference (e.g. all
at 6V) ­ but if one bulb had a significantly higher resistance than the…

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Appliances with a metal exterior must be earthed, appliances with plastic cases do not ­ they are
said to be "double insulated" and are connected to the mains supply using only a neutral wire and a
live wire.

There are also fuses fitted to the plugs. If a fault develops…

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Comprehensive notes for this AQA unit. Covers the whole of the unit.

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thank you Lisa! Just downloaded these (biology, chemistry and physics) all ready for my holidays so I dont have to take so much with me, I love the layout, it's very easy to read and understand :)

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Thanks a lot. xD

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