AQA GCSE Physics - unit 2 (Higher)

A brief, but essential look into aqa unit 2 physics. created by a teacher, its too good not to share, really helped me in the past; ENJOY!!! 

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Preview of AQA GCSE Physics - unit 2 (Higher)

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Unit 2 Physics: Revision Notes
Formulae you need to know are in bold.
1 Motion
· The slope of a distancetime graph represents speed.
· The velocity of a body is its speed in a given direction.
· acceleration = change in velocity / time taken
· The slope of a velocitytime graph = acceleration.
· The area under a velocitytime graph = distance travelled.
2 Forces
· can you sketch a velocitytime graph for a body at
terminal velocity.
· The faster a body moves through a fluid the greater the frictional
force which acts on it.
· A body falling through a fluid will initially accelerate due to gravity,
eventually the resultant force on the body will be zero, and it will fall
at its terminal velocity.
· at terminal velocity Weight down = Friction up
· weight = mass × gravitational field strength
(newton, N) (kilogram, kg) (newton/kilogram, N/kg)
· Whenever two bodies interact, the forces they exert on each other are equal & opposite.
· A number of forces acting on a body may be replaced by a single force which has the same effect as
the original set of forces. The single force is called the resultant force (here in red):
·If the resultant force acting on a stationary body is zero, it is either at rest, or moving at a steady

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If the resultant force acting on a stationary body is not zero, the body will accelerate in the direction of
the resultant force.
· Resultant force = mass × acceleration
(newton, N) (kilogram, kg) (metre per second squared m / s2 )
· When a vehicle travels at a steady speed the frictional forces balance the driving force.
· Stopping distance = braking distance + thinking distance.…read more

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h = 4
· A driver's reaction time is affected by tiredness, drugs or alcohol.
· A vehicle's braking distance depends on road and weather conditions, and the condition of the
3 Work and Energy
· When a force causes a body to move through a distance,
energy is transferred, and work is done.…read more

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Static electricity
· When materials are rubbed against each other they can become electrically charged. Negatively
charged electrons are rubbed off one material onto the other.
· The material that gains electrons becomes
negatively charged. The material that loses
electrons has an equal positive charge.
· Two charged bodies will exert a force on
each other.
· Like charges repel, unlike charges attract.
· Electric charges move easily through
· The rate of flow of electric charge is called the current.…read more

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· For components connected in parallel:
- potential difference across each component is the same
- the total current through the whole circuit is the sum
of the currents through the separate components.
7 Mains electricity
· Cells and batteries supply current which always passes in the same direction. This is called direct
current (d.c.).
· An alternating current (a.c.) is one which is constantly changing direction. Mains electricity is an a.c.
supply.…read more

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In an atom, number of electrons = number of protons in the nucleus. The atom has zero net electrical
· Atoms may lose or gain electrons to form ions.
· Atoms of a particular element have the same number of protons.
· Atoms of different elements have different numbers of protons.
· Atoms of the same element which have different numbers of neutrons are called isotopes.
· The number of protons is called the atomic number.…read more


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