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GCSE PHYSICS REVISION

Speed
Speed is a measure of how fast an object is moving.
Speed (m/s) = Distance (m) /Time (s)

Distance-time graphs
The slope on a distance time graph represents the speed of an object,
the steeper the slope the greater the speed.
Speed = change in Y/change…

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o The stopping distance ­ distance traveled under the breaking
force.
The overall stopping distance increases when ­
o The vehicle is traveling faster.
o Adverse weather conditions e.g. wet or icy roads.
o The driver's reaction e.g. drugs, alcohol, tiredness etc.
o The condition of the vehicle.
The greater…

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o The air resistance increases until it is equal too the weight,
meaning the resultant force is now 0 so the falling speed become
constant, this is terminal velocity.

Work
When a force moves an object, work is done on the object meaning the
transfer of energy.
Work done (J)…

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o Increase the momentum of a moving object.
o Decrease or stop the momentum of a moving object.
The extent of the change in momentum depends on ­
o The size of the force
o The length of time the force is acting on the object.
Force (N) = change…

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1. Solid smoke particles become negatively charged as they pass by
a negatively charged metal grid.
2. The particles are then attracted to the positive collecting plates
as negative charges attract.
3. The solid smoke particles are then collected when the collecting
plates are knocked.
The Photocopier ­




Discharge of…

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I




This flow of electrons through a solid conductor is called an electric
current.
Metal conducts electricity well as electrons from their atoms can move
freely throughout the metal structure.
The greater the charge on an isolated object, the greater the potential
difference between the object and earth. If the…

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Circuits
An electric current will flow through an electrical component if there is
a potential difference (voltage) across the ends of the component.
In a circuit ­
o The potential different is measured in volts (V) using a voltmeter
connected in parallel.
o The current is measured in amperes (A)…

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Resistor




Fuse




Ammeter




Variable resistor




Thermistor




Light dependent resistor

Resistance
Resistance is a measure of how hard it is to get a current though a
component at a particular potential difference.
Current-potential difference graphs show how the current through the
component varies with the potential difference across it.
Potential difference…

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As long as the temperature of the resistor stays
constant, the current through the resistor is
directly proportional to the voltage across the
resistor. This is regardless of which direction the
current is flowing.




As the temperature of the filament lamp increases,
and the bulb gets brighter, then the resistance…

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going from one terminal of the battery to the other.
The total current in the main circuit is equal to the sum of the currents
through the separate currents.
The potential difference for each component is equal to the potential
difference of the battery and the other components.

Currents
A…

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