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Physical Quantites

Year 13 Physics
Matching a description of aphysical quantity with its name

ImpulseEqual to the change in momentum of an object. Can be calculated by multiplying the average force acting by the time taken
Centre of MassThe point where the total mass of an object (or objects) appears to act
Velocity of Centre of MassCan be calculated by dividing the total momentum by the total mass
Angular DisplacementThe angle turned through by an object as it rotates
Angular VelocityThe rate of change of angular dispalcement (The angle turned through every second) by a rotating object
Angular AccelerationThe rate of change of angular velocity (The change in angular velocity every second)
Rotational InertiaA measure of how hard it is to start or stop an object rotating (Depends on mass and mass distribution)
Rotational Kinetic EnergyEnergy possessed by a rotating object
Angular MomentumThe product of rotational inertia times angular velocity
TorqueThe turning effect of a force
Natural FrequencyThe frequency of SHM if the system is allowed to oscillate freely
ResistivityA quantity which compares the resistance of different materials
Magnetic FluxMagnetic field strength (in Telsa) through each square metre
CapacitanceCharge stored (in Coulombs) on the plates of a capacitor per volt across the plates
InductanceThe voltage induced across an inductor as the current changes by 1 amp per second
ReactanceThe ability of a capacitor or inductor to limit the size of the current in an AC circuit
ImpedanceThe combined effect of resistance and reactance to limit the current in an AC circuit
VelocitySpeed in a given direction
AccelerationThe rate at which an object changes its velocity
Acceleration caused by gravityThe rate at which object s change their velocity when acted on by gravity
ForceA push or pull in a particular direction
Centripetal ForceA force that turns an object (It is directed towards the centre of the circle or curve)
Spring ConstantThe force required to extend (or compress) a springby 1m
Linear MomentumThe product of mass times velocity
EnergyThe capacity to do work
FrequencyThe number of cycles per second
PeriodTime taken for one complete cycle
AmplitudeDistance from equilibrium position to the maximum point (half the maximum displacement)
WavelengthDistance in a wave from one point to the next repetition of that point
CurrentCharge flowing (in Coulombs) per second
VoltageEnergy difference per coulomb of charge between two points
EMFVoltage of a battery when no current is flowing
ResistanceA measure of how well a material conducts electricity
Internal ResistanceResistance of a power source
Magnetic Field StrengthThe size of the magnetic force acting in an area
WorkEnergy transferred
PowerEnergy transferred per second
Refractive IndexA comparison of the speed of light in different mediums (large refractive idex = slow speed)
Work FunctionMinimum energy needed by an electron to escape the surface of a particular metal

Ms Forsyth

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