Definitions For Edexcel AS Physics

Just what it says in the title really. It's not split up into Unit 1 and Unit 2 - it is alphabetical though. Also, I'd like to point out that these may not be definitions that are guarenteed to get you full marks in the exam - for example, I use the word "light" in the definition of "plane polarised light", but in one exam you had to specify that light was electromagnetic radiation to get all the marks. Stuff like that my occasionally crop up, so in the exam, look to see how many marks are for the definition and try to make as many separate points as there are marks, and don't blame me if my definitions weren't quite as accurate as needed (they are all correct though). If you spot any missing, just comment and I'll endeavour to put them in.

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Acceleration The rate of change of velocity with respect to time (a= v/t)
Ammeter A device used to measure electric current in a circuit, connected in series.
Assumed to have negligible resistance.
Ampere SI unit for electric current (rate of flow of charge)
Amplitude The maximum displacement of a…

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Gravitational The energy an object has due to its relative position above the ground
Potential Energy ( GPE=mg H)

Hard A material is hard if it is difficult to indent or scratch the surface
Hooke's Law The extension of a spring is in direct proportion with load added…

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Phase Waves are in phase if they have the same frequency and wavelength, and
identical points line up exactly (e.g. troughs of wave 1 line up with the
troughs of wave 2). Waves are out of phase by an angle - 180 (or
radians) out of phase means that wave…

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Thermistor A resistor that changes its resistance depending on its temperature
(usually temperature increase resistance decrease)
Threshold The lowest frequency of electromagnetic radiation that will result in the
Frequency emission of photoelectrons from a specified metal surface (E=hf)
Total internal The complete reflection of a light wave due to its…

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Coulomb (C) Unit of charge (Q)
Electronvolt (eV) The energy given to one electron when it passes through a potential
difference of one volt (1 eV = 1.6x10-19 J)
Joule (J) The SI unit of work done, or energy. It is the work done when a force of 1




Brittle should be:

A material is Brittle if, when undergoing a tensile force, there is little or no plastic deformation.

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