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It compiles definitions of key terminology and associated units drawn from the current AS/A specification, aiming to provide accessible wording without losing scientific rigour. 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It consists of the definitions of terms from the current AS/A specification.  \nThe definitions were produced by the Principal Examining 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 rigour.  \nThe rationale for the production of this document is to help learners towards an understanding of the basic vocabulary of Physics, without which clear explanations are impossible. It will also of course aid the learners in revision, as knowledge of terms, definitions and units is examined in every paper.  \nHelen Francis  \nDomain Leader-Mathematics and Science Subject Officer-Physics and Electronics  \n[helen.francis@eduqas.co.uk](helen.francis@eduqas.co.uk)  \nA level COMPONENT 1  \n\n| Section | Item | Definition |  |  |\n| --- | --- | --- | --- | --- |\n| 1.1 (a) | Quantity | In S. I. a quantity is represented by a number × a unit,(e.g. m = 3.0 kg) . |  |  |\n| 1.1 (d) | Scalar | A scalar is a quantity that has magnitude only. |  |  |\n|  | Vector | A vector is a quantity that has magnitude and direction. |  |  |\n| 1.1 (f) | Resolving a vector into components in particular directions | This means finding vectors (the so-called components) in these directions, which add together vectorially to make the original vector, and so, together, are equivalent to this vector. |  |  |\n| 1.1 (g) | Density of a material, ρ | density= | mass\u003Cbr>volume | Unit: kg m−3 or g cm-3 |\n|  |  | in which mass and volume apply to any sample of the material. |  |  |\n| 1.1 (h) | Moment (or torque) of a force | The moment (or torque) of a force about a point is defined as the force × the perpendicular distance from the point to the line of action of the force,\u003Cbr>i.e. moment = F × d\u003Cbr>Unit: N m [N. B. the unit is not J] |  |  |\n| 1.1 (i) | The principle of moments | For a system to be in equilibrium, ∑ anticlockwise moments about a point = ∑ clockwise moments about the same point. |  |  |\n| 1.1 (j) | Centre of gravity | The centre of gravity is the single point within a body at which the entire weight of the body may be considered to act. |  |  |\n| 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 | total distancetravelled ∆x\u003Cbr>Mean speed= =\u003Cbr> total time taken  ~~ ∆~~t\u003Cbr>Unit: m s-1 |  |  |\n|  | Instantaneous speed | Instantaneous speed = rate of change of distance\u003Cbr>Unit: m s-1 |  |  |\n|  | Mean velocity | total displacement\u003Cbr>Mean velocity = \u003Cbr>total timetaken\u003Cbr>Unit: m s-1 |  |  |\n|  | Instantaneous velocity | The velocity of a body is the rate of change of displacement.\u003Cbr>Unit: m s-1 |  |  |\n|  | Mean acceleration | changein velocity ∆v\u003Cbr>Mean acceleration = =\u003Cbr> time taken  ~~ ∆~~t\u003Cbr>Unit: m s-2 |  |  |\n|  | Instantaneous acceleration | The instantaneous acceleration of a body is its rate of change of velocity. Unit: m s-2 |  |  |\n| 1.2 (e) | 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’ force (e.g. pull of gravity) . |  |  |\n| 1.3 (a) | Force, F | A force on a body is a push or a pull acting on the body from some external body.\u003Cbr>Unit: N |  |  |\n\n\n|  | Newton’s 3rd law | If a body A exerts a force on a body B, then B exertsan equal and opposite force on A. |\n| --- | --- | --- |\n| 1.3 (c) | Σ F = m a | The mass of a body × its acceleration is equal to the vector sum of the forces acting on the body. This vector sum is called the resultant force. |\n| 1.3 (d) | Momentum | The momentum of an object is its mass multiplied by its velocity. (p = mv) . It is a vector.\u003Cbr>UNIT: kg m s-1 or Ns |\n| 1.3 (e","cbCaihRJilJo6B9R","https://ap.wps.com/l/cbCaihRJilJo6B9R","pdf",414502,18,"English","# Introduction\n# A level Component 1 - Definitions\n## Quantities and vectors\n## Dynamics: force and momentum\n## Work, energy and power\n## Motion in circles: period, frequency and radian","[{\"question\":\"What is the purpose of this GCE Physics definitions document?\",\"answer\":\"It helps teachers prepare candidates for the GCE Physics examination by providing definitions of key physics terms, with accessible wording while maintaining rigour.\"},{\"question\":\"What material does the document include?\",\"answer\":\"It includes definitions of terms and their related units taken from the current AS/A Physics specification, supporting both learning and revision.\"},{\"question\":\"Why are term and unit knowledge important for the exam?\",\"answer\":\"Knowledge of terms, definitions and units is examined in every paper, so clear understanding supports accurate responses.\"}]","GCE Physics - Terms, Definitions & Units - May 2015 | PDF",1790879678,45]