# Shared Flashcard Set

## Details

P2 Revision Key Topics
AQA GCSE SCIENCE PHYSICS P2
62
Physics
12/29/2011

Term
 Acceleration (m/s squared) =
Definition
 change in velocity (m/s) ------------------------               time taken for change (s)   An Increase in the rate of speed
Term
 Weight (N) =
Definition
 Mass (kg) x gravitational field strength (N/kg)
Term
 Resultant force (N) =
Definition
 mass (kg) x acceleration (m/s²)
Term
 Moment (Nm) or Work done (J) =
Definition
 force applied (N) x distance moved in direction of force(m)
Term
 Force (N) =
Definition
 change in momentum [kg(m/s)]----------------------------time taken for the change (s)
Term
 Potential difference (V) =
Definition
 Current (A) x resistance (Ω)
Term
 Power (W) =
Definition
 energy transferred (J) ----------------------time (s)
Term
 Power (W) =
Definition
 current (A) x potential difference (V)
Term
 Energy transformed (J) =
Definition
 Potential difference (V) x Charge (C)
Term
 Charge (C) =
Definition
 current (A) x time (s)
Term
 Speed
Definition
 Scalar - A number with only magnitude, not direction.
Term
 Velocity
Definition
 Speed with directionvelocity (m/s) = acceleration (m/s2) x time (s)
Term
 m/s
Definition
 Speed (m/s) = distance/timeVelocity (m/s) = acceleration (m/s2) x time (s)
Term
 m/s^2
Definition
 Acceleration
Term
 Motion
Definition
 Something moving when a force is applied
Term
 Rate
Definition
 The speed in which something changes
Term
 Air resistance (drag)
Definition
 Friction of air particles slowing something down
Term
 Terminal Velocity
Definition
 Balanced forces - When drag force and weight act equally on an object and have a net force of zero, so cancelling the other out Constant speed when a falling object reaches a state which prevents further acceleration due to gravity and resistance.
Term
 Frictional forces
Definition
 A force in the opposite direction – resistance
Term
 Gravitational field strength
Definition
 A gravitational attraction between objects with mass, giving them weight (An object with mass and GFS, mass (kg) is just quantity of matter in it). A force of acceleration due to gravity. Earth’s GFS is 10N/Kg
Term
 Mass (kg)
Definition
 m = f/amass = force (N)/acceleration (GFS is acceleration)
Term
 Force is measured in...
Definition
 Newtons (N)
Term
 Resultant force
Definition
 A net force – vector – produced when multiple forces act on an object
Term
 Work done or Energy Transfer
Definition
 Force (N) x distance (m)
Term
 Explosion
Definition
 A violent explosion – energy is transferred outwards
Term
 Unit of energy
Definition
 Joules (J)
Term
 Momentum =
Definition
 Momentum (Kg m/s) = Mass (kg) x velocity(m/s)
Term
 Kinetic energy (J)
Definition
 ½ x mass x velocity2
Term
 Magnitude
Definition
 Size
Term
 (Gravitational) Potential energy (J)
Definition
 Depends on mass and height above the Earth’s surface. A falling object transfers GPE to kinetic energy
Term
 Reaction time
Definition
 Time taken between stimulus and response
Term
 Stopping distance
Definition
 Thinking distance + breaking distance
Term
 Thinking distance
Definition
 Reaction time + time taken to think to press the breaks
Term
 Braking distance
Definition
 Distance car moves until the car stops
Term
 Absorb
Definition
 Take in energy
Term
 Alpha
Definition
 Helium nuclei - Ionizing atoms – low penetrating power, not travelling far
Term
 Atomic number
Definition
 Number of protons in the nucleus of an atom
Term
Definition
 The never changing microwave radiation from the Big Bang
Term
 Beta
Definition
 High energy electrons, high penetrating, stopped by aluminium
Term
 Chain reaction
Definition
 Self-sustaining, spreading reaction – a series of events each caused by the previous one
Term
 Fission
Definition
 A process where heavier atoms split/ divide into multiple smaller atoms. A chain reaction - releasing masses of energy, absorbing neutrons. E.g. Uranium-235, Plutonium-239
Term
 Fusion
Definition
 Combining multiple smaller atoms to make larger atoms. Chain reaction – releasing masses of energy as nuclei combine.
Term
 Current
Definition
 The flowing rate of electrical charge
Term
 What factors affect the stopping distance of a vehicle
Definition
 Tiredness, alcohol and drugs The faster the vehicle is travelling The heavier the vehicle In adverse weather conditions Poorly maintained vehicles
Term
 What is the constant acceleration of a freely falling object
Definition
 10m/s2
Term
 What does this graph show? [image]
Definition
 The resistance of an ohmic conductor (eg. a wire)
Term
 What does this graph show: [image]
Definition
 Filament lamp - The filament lamp doesnot follow Ohm's Law. The resistance of a filament lamp increases as the temperature of its filament increases. As a result, the current flowing through a filament lamp is not directly proportional to the voltage across it. This is the graph of current against voltage for a filament lamp.
Term
 What does this graph show: [image]
Definition
 Diode - In the 'forward' direction, the line curves towards the current axis. So the current is not directly proportional to the potential difference. A diode is not an ohmic conductor. In the reverse direction, the current is negligible so its resistance in the reverse direction is much higher than in the forward direction.
Term
 How is current calculated in a series circuit?
Definition
 At=A1=A2=A3
Term
 How is potential difference calculated in a series circuit?
Definition
 Vt=V1+V2+V3
Term
 How is resistance calculated in a series circuit?
Definition
 Rt=R1+R2+R3
Term
 How is the total current calculated in a parallel circuit?
Definition
 At=A1+A2+A3
Term
 How is the total potential difference calculated in a parralel circuit?
Definition
 Vt=V1=V2=V3
Term
 How is the total resistance found in a parallel circuit?
Definition
 Rt= R1+ R2+ R3
Term
 [image]
Definition
 Resistor - a fixed resistor limits the current in a circuit
Term
 [image]
Definition
 A variable resistor allows the current to be varied
Term
 How is an ammeter connected to a circuit?
Definition
 It is connected in series with the component which needs to be measured.
Term
 How is a volt meter connected to a circuit?
Definition
 It is connected in parallel with he components which need to be measured.
Term
 How is resistance calculated?
Definition
 Potential difference (volts) Current (amperes)
Term
 What is Ohm's law?
Definition
 The current through a resistor at constant temperature is directly proportional to the potential difference across the resistor
Term
 What is an ohmic conductor?
Definition
 A conductor that has a constant resistance and therefore obeys Ohm's law
Term
 Resistor
Definition
 Limits the current in a circuit
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