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Physics Advanced Subsidiary Level
List of Definitions


Scalar : Has magnitude only. Examples are Mass, Volume and
Energy.
Vector : Has magnitude and direction. Examples are Force,
Velocity and acceleration.
Accuracy : Is how close to the `real value' a measurement is.
Precision : Is that part of accuracy that…

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Newton's 2nd law : A resultant force acting on a body will cause a
change in momentum in the direction of the force. The rate of
change of momentum is proportional to the magnitude of the
force.
Conservation of momentum law : The total momentum of a
closed system before…

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Displacement of a particle : Is its distance from its equilibrium
position. The unit is the metre (m).
Amplitude : Is the maximum displacement of a particle from its
equilibrium position. The unit is metre (m).
Period : Is the time taken for one complete oscillation of a particle
in…

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Constructive interference : Is if the two sets of waves are exactly
in phase, the combined wave has an amplitude equal to the sum
of the two amplitudes.
Destructive interference : Is if the two sets of waves are 180* out
of phase, the two waves will subtract.
Electric Field…

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Nucleon number : Is the total number of protons plus(+) neutrons
in a nucleus.
Isotopes : Have the same number of protons in the nucleus but
different numbers of neutrons.
Nuclide : Is a single type of nucleus with a specific nucleon
number and a specific proton number.
Leptons :…

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