# AS Level Physics Definitions

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• Created by: ish0113
• Created on: 13-03-20 06:10
Scalar
Has magnitude only. Eg: Mass, Volume, Energy
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Vector
Has magnitude and direction. Eg: Force, Velocity, Acceleration
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Accuracy
How close the measured value is to true value
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Precision
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Uncertainty
Range of values in which the measurement can lie
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Distance
Length between two points measured along the straight line joining the two points
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Displacement
Distance from a fixed reference point in a specific directioon
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Speed
Distance travelled per unit time
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Velocity
Change in displacement per unit time
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Acceleration
Rate of change of velocity
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Mass
Total amount of matter in a body
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Weight
Gravitational pull on a body
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Linear momentum
Product of mass and velocity
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Centre of gravity
A point through which all the weight is considered to act
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Density
Mass per unit volume
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Pressure
Force per unit area
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Work done
Product of force and perpendicular distance moved in the direction of force
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Energy
Ability to do work
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Power
Rate of doing work
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Stress
Force per unit cross sectional area of wire
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Strain
Extension per unit length of unstretched wire
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Amplitude
Maximum displacement from its equilibrium position
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Period
Time taken for one complete oscillation
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Frequency
Number of complete oscillations per unit time
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Wavelength
Distance between two points on successive oscillations that are vibrating exactly in phase
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Wave speed
Distance travelled by wave energy per unit time
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Intensity
Energy transmitted per unit time per unit cross sectional area at right angles to the wave velocity
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Doppler Effect
Change in frequency of waves due to the relative motion of the wave source and observer
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Constructive interference
If two sets of waves are in phase, the combined amplitude of both the waves is equal to the sum of amplitudes of the two individual waves
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Destructive interference
If two waves are 180 degrees out of phase, the waves cancel each other out
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Electric field strength
Force per unit positive charge on a stationary point charge
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Current
Movement of electric charge
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Potential difference
Work done in moving a unit positive charge from one place to another
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Resistance
Potential difference/Current
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Proton Number
Number of protons in an atom
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Nucleon Number
Number of protons + Number of neutrons in an atom
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Isotopes
Atoms of the same element with same number of protons but different number of neutrons
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Nuclide
Single type of nucleus with specific proton number and specific nucleon number
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Leptons
Electrons, neutrions, antinutrions and positron which have no further structure
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Protons, neutrons and their antiparticles
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Quarks
Different type of hadrons, each type made up of different combinations of two or three smaller particles
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## Other cards in this set

### Card 2

#### Front

Has magnitude and direction. Eg: Force, Velocity, Acceleration

Vector

### Card 3

#### Front

How close the measured value is to true value

### Card 5

#### Front

Range of values in which the measurement can lie