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AQA Physics Unit 2 ­ Key Points
1.1 Distance Time Graphs
The distance-time graph for any object that is
- Stationary is a horizontal line
- Moving at a constant speed is a straight line that slopes upwards
The gradient of a distance-time graph for an object represents the…

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2.4 On the road
Friction and air resistance oppose the driving force of a car.
The stopping distance of a car depends on the thinking distance and the braking distance.
High speed, poor weather conditions and poor maintenance all increase the braking
distance. Poor reaction time and high speed both…

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Momentum is conserved whenever objects interact, provided the objects are in a closed
system so that no external forces act on them.

3.5 Explosions
Momentum is mass x velocity and velocity is speed in a given direction.
When two objects push each other apart, they move apart:
with different speeds…

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Thermistor: resistance decreases if its temperature increases.
LDR: resistance decreases if the light intensity on it increases.

4.5 Series circuits
For components in series:
the current is the same in each component
adding the potential differences gives the total potential difference.
Adding the resistances gives the total resistance of resistors…

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A mains appliance with a plastic case does not need to be earthed because plastic is an
insulator and cannot become live.

5.4 Electrical power and potential difference
The power supplied to a device is the energy transferred to it each second.
Electrical power supplied (watts) = current (amperes)

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change in the nucleus

nucleus loses 2 protonsAand
2 in the nucleus changes
neutrons into a proton
Particle emitted

2 protons and 2 neutrons
electron is created in the nucleus
as an particle and instantly emitted
Equation (higher)
A A-4 4 A A 0
Z X Z-2 Y…

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Energy is released when two light nuclei are fused together. Nuclear fusion in the Sun's
core releases energy.
A fusion reactor needs to be at a very high temperature before nuclear fusion can take place.
The nuclei to be fused are difficult to contain.

7.3 Nuclear issues
Radon gas is…


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