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Power
Rate of transfer of energy.
Precision
The degree of exactness of a measurement, usually expressed as the uncertainty of the readings used to obtain a measurement.
Pressure
Force per unit area acting on a surface perpendicular to the surface.
Principle of conservation of energy
Energy cannot be created or detroyed.
Principle of moments
For an object in equilibrium, the sum of the clockwise moment about any point= the sum of the anticlockwise moment about that point.
Probable error
Estimate of the uncertainity of a measurement.
Progressive waves
Waves which travel through a substance or through space if electromagnetic.
Projectile
A projected object in motion acted on only by the force of gravity.
Quark
Protons and neutrons nad other hadrons consist of quarks. There are sex types of quarks, the up quark, the down quark, the strange quark, the charmd quark, the top quark and the bottom quark.
Quark model
A quark can join with an antiquark to form a meson or with two other quarks to form a baryon. An antiquark can join with two other antiquarks to form an antibaryon.
Radian
Measure of an angle defined such that 2pi radians=360 degrees.
Random error
Error of measurement due to readings that vary randomly with no recognisable pattern or trend or bias.
Range of a set of a readings
The range of a set or readings of the same measurement is the different between the minimum and the maximum reading.
Range of an instrument
The difference between the minimum and the maximum reading tha can be obtained using the instrument.
Refraction
Change of direction of a wave when it crosses a boundary where its speed changes.