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It compiles definitions of key vocabulary drawn from the current AS/A specification, produced by Principal Examiners for PH1, PH2, PH4 and PH5. The document emphasizes accessible wording for students while maintaining rigor, supporting revision because definitions, terms and units are examined in every paper. 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It consists of the definitions of terms from the current AS/A specification.  \nThe definitions were produced by the Principal Examiners for PH1, 2, 4 and 5 working as a team. It is acknowledged that there will always be disagreement on precise definitions, but the aim has been to produce wording which is accessible to students while preserving a fair level of rigor. Suggestions for improvements and the identification of omissions are welcome and should be addressed to me at the WJEC.  \nThe rationale for the production of this document is to help students towards an understanding of the basic vocabulary of Physics, without which clear explanations are impossible. It will also of course aid the students in revision for their unit tests, as knowledge of terms, definitions and units is examined in every paper. The stimulus for its production was an awarding meeting at which a large number of papers was seen, in which candidates had lost many marks for inadequate knowledge of definitions.  \nGareth Kelly  \nExaminations Officer for Science/Physics & Electronics WJEC, 245 Western Avenue, Cardiff CF5 2YX  \n029 2026 5081 (direct line)  \n[gareth.kelly@wjec.co.uk](gareth.kelly@wjec.co.uk)  \nSeptember 2003.  \nPhysics Terms Definitions and Units page 2  \nPH1  \n\n| Ref | Item | Definition |\n| --- | --- | --- |\n| 3.1.1(c) | Scalar | A scalar is a quantity that has magnitude only. |\n|  | Vector | A vector is a quantity that has magnitude and direction. |\n| 3.1.1(i) | The moment (or torque) of a force. | The turning effect of a force (or moment or torque) about a point is defined as the force x the perpendicular distance from the point to the line of action of the force, i.e. moment = F × d.\u003Cbr>UNIT: Nm. |\n| 3.1.1(j) | The principle of moments. | For a system to be in equilibrium, ∑ anticlockwise moments about a point = ∑ clockwise moments about the same point. |\n| 3.1.1(k) | Centre of gravity. | The centre of gravity is the single point within a body at which the entire weight of the body is considered to act. |\n| 3.1.2(a) | Displacement | The displacement of a point B from a point A is the shortest distance from A to B, together with the direction. UNIT: m. |\n|  | Mean Speed | Mean speed = os~~l~~tanct~~i~~meettravea~~k~~enlled = ~~ ~~xt UNIT: ms-1. |\n|  | Instantaneous Speed | instantaneous speed = rate of change of distance\u003Cbr>UNIT: ms-1. |\n|  | Mean Velocity | Mean velocity = total displacement total time taken\u003Cbr>UNIT: ms-1. |\n|  | Instantaneous Velocity | The velocity of a body is the rate of change of displacement.\u003Cbr>UNIT: ms-1 |\n|  | Mean Acceleration | Mean Acceleration = changet~~i~~mn~~ ~~velota~~k~~encity = ~~ ~~vt\u003Cbr>UNIT: ms-2. |\n|  | Instantaneous Acceleration | The instantaneous acceleration of a body is its rate of change of velocity. UNIT: ms-2 |\n|  | Terminal Velocity | The terminal velocity is the constant, maximum velocity of an object when the resistive forces on it are equal and opposite to the accelerating forces (e.g. pull of gravity) . |\n| 3.1.3(b) | Hookeís Law | The tension in a spring or wire is proportional to its extension from its natural length, provided the extension is not too great. |\n|  | Spring Constant | The spring constant is the force per unit extension. UNIT: Nm-1 . |\n\nPhysics Terms Definitions and Units page 3  \n\n| 3.1.3(c) | Stress | Stress is the force per unit cross-sectional area when equal opposing forces act on a body.\u003Cbr>UNIT: Pa or Nm-2 . |\n| --- | --- | --- |\n|  | Strain | Strain is defined as the extension per unit length due to an applied stress. UNIT: none |\n|  | The Young Modulus | Young Modulus E = ~~ ~~tteennssi~~i~~l~~l~~ee~~ ~~ssttrreas~~i~~sn\u003Cbr>Unless otherwise indicated this is defined for the H","cbCaiif15bYVE6ip","https://ap.wps.com/l/cbCaiif15bYVE6ip","pdf",151815,11,"English","# Terms, Definitions & Units\n## Scalars and vectors\n## Moments, torque, and equilibrium\n## Displacement, speed, velocity, acceleration\n## Stress, strain, and Young modulus\n## Amplitude, wavelength, frequency, wave velocity\n## Intensity, transverse and longitudinal waves\n## Superposition, coherence, and phase difference\n## Snell's law","[{\"question\":\"What is the purpose of this Physics terms and definitions document?\",\"answer\":\"It helps teachers prepare candidates for the GCE Physics examination by providing definitions of essential Physics vocabulary. It also supports student revision because terms, definitions and units are tested in every paper.\"},{\"question\":\"Who produced the definitions in the document?\",\"answer\":\"The definitions were produced by Principal Examiners for PH1, PH2, PH4 and PH5 working as a team.\"},{\"question\":\"How does the document handle disagreements about definitions?\",\"answer\":\"It acknowledges that precise definitions may differ and aims to use wording that remains accessible to students while preserving a fair level of rigor, with suggestions welcomed to address omissions or improvements.\"}]","Physics Terms, Definitions & Units - Part 1 - GCE AS/A | PDF",1790879669,28]