Physics Unit 2 Keywords

Once again, here are the Physics Unit 2 GCSE AQA Key words and their descriptions I have come across again!

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P2 Keywords.
Acceleration: The rate at which a body increases in speed. Change in velocity per
second (m/s²)
Alternating Current (ac): An electric current
which changes direction of flower continuously.
Attraction: The drawing together of two
materials with different types of charges.
Alpha Radiation: Alpha particles, each
composed of 2 protons and 2 neutrons, emitted
by unstable nuclei. Positively charged.
Beta Radiation: Beta particles that are
high+energy electrons created in and emitted
from unstable nuclei. Negatively charged.
Black Dwarf: A star that has faded out and gone cold.
Black Hole: An object in space that has so much mass that nothing, not even light, can
escape from its gravitational field.
Charged: Having an overall positive or negative electric charge.
Circuit Breaker: An electromagnetic safety device that
opens a switch and cuts the current off when too much
passes through it.
Current: The rate of flow of electric charge. Measured
in Amps.
Conservation of Momentum: In a closed system, the
total momentum before an event is equal to the total
momentum after an event. Momentum is conserved in any
collision or explosion provided no external forces act on
the objects.
Control Rod: A metal rod used to absorb neutrons in a
nuclear reactor so that only one fission neutron per
fission (on average) goes on to produce further fission.
Coolant: Fluid in a sealed circuit pumped through the core of a nuclear reactor to
remove heat to a heat exchanger.
Diode: An electrical device that allows current to flow in one direction.
Direct Current (dc): An electric current that flows in one direction.
Distance: The space between two points.
DistanceTime Graph: Gradient represents speed.
Directly Proportional: A graph will show this if the line of best fit is a straight line
through the origin.
Drag Force: A force opposing the motion of an object due to the fluid (e.g. air)
flowing past the object as it moves.
Electron: A negatively charged subatomic particle.
Electrostatic: Producing or caused by static electricity.

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Elastic Potential Energy: Energy stored in an elastic object when work is done to
change its shape.
Force: A push or pull acting on an object. (In newtons, N)
Friction: The force that resists movement between two surfaces.
Fuse: A thin piece of wire that melts to break the circuit when the passing current is
overloaded.
Free electron: An electron that moves about freely inside a metal and is not held
inside the atom.…read more

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Nuclear Fusion: The process in which small nuclei are forced together so they fuse
with each other to form a larger nucleus. (Hydrogen and helium).
Parallel Circuit: A circuit where there is more than one path for the current to take.
Potential Difference: The difference in electrical charged between two charged
points.
Prostar: The concentration of dust clouds and gas in
space that forms a star.
Proton: A positively charged subatomic particle.
Repulsion: The pushing away of two materials with
the same type of charge.…read more

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