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# AQA GCSE Physics P2 (last exam June 2017)

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## Andy Darvill

on 18 June 2016

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#### Transcript of AQA GCSE Physics P2 (last exam June 2017)

AQA
GCSE Physics
Topic P2
Motion
Forces
Work,
Energy,
Momentum
Electricity
Mains
electricity
Speed = distance / time
Distance-time graphs
Velocity - time graphs
Area under graph = distance travelled
acceleration = change in velocity
time taken for change

a = v - u
t
Force = mass x acceleration

F = m a
Springs
Hooke's Law:
stretching springs
Stopping distance =
thinking distance + braking distance
Be able to list 3 factors that affect
thinking distance and braking distance
and state how they affect it
(e.g.
alcohol
increases reaction time, which
increases thinking distance
)
Impact forces
depend on
rate of change of momentum
Momentum
(kg m/s)
=
mass
(kg)
x velocity
(m/s)

p = mv
Kinetic energy

= "half m v squared"
F t = m (v-u)

F = m (v-u)
t
So
increasing the duration (t)
of the collision
will
decrease the force
.

That's what airbags and crumple zones do.
"Work Done" is the energy needed to move an object.

W.D. = Force x distance
Grav. Potential Energy
= m g h
= Work Done lifting an object
= weight x height lifted
Throwing / Falling objects:
GPE at the top = KE at the bottom
Alpha
Beta
Gamma
Charge = +2
Mass = 4
Same as a He nucleus
Ionises strongly
Weak penetrating power
Charge = -1
Mass = tiny
Same as an electron
Ionises moderately
Moderate penetrating power
No charge
No mass
An electromagnetic wave
Ionises weakly
Strong penetrating power
Alpha
Beta
Gamma
Nuclear fission
= splitting large nuclei (e.g. U235)
to release energy
Nuclear fusion
= fusing small nuclei (e.g. H) together
to release energy. Lots of it.
Energy from
the nucleus
Stars
Line Spectra tell us
the elements in the star,
redshift of the lines tells us the star's speed
Life cycle of stars like our Sun
Life cycle of large stars
Link to "expanding universe" in Topic P1
Current (I) is the same all around a series circuit
Current is shared out in a parallel circuit
Amperes, ammeter
Voltage (V) is shared out in a series circuit
Voltage is the same across components in parallel
Also called "potential difference" (p.d.)
Volts, voltmeter
Ohm's Law
Resistance (Ohms) = voltage / current
R = V/I
I-V graphs for:
resistors
diodes
LDR's
Thermistors
Lamps
tells you the resistance
Half life
:
the time it takes for half of the
unstable nuclei to decay
UK mains is 230V a.c. 50Hz
Electrical safety
Fuses
RCD's
Double insulation
Earthing
Power
(Watts)
= voltage x current
P = VI
Charge
(Coulombs)
= current x time Q = It
Energy = voltage x charge E = VQ
Higher [=H] &
Foundation
[=H]
[=H]
3-pin 13A
mains plugs
Balanced forces (resultant = 0)
means constant velocity
Terminal velocity
Rutherford's Experiment
= how we know atoms have a
small, +ve nucleus