Model Definitions 5.0 / 5 based on 1 rating ? MathematicsMechanicsA2/A-levelEdexcel Created by: chalky-nerdCreated on: 08-01-20 19:37 Particle Dimensions of the object are negligible 1 of 25 Modelling Assumptions of a Particle Mass is concentrated at single point; rotational forces and air resistance can be ignored 2 of 25 Rod All dimensions are negligible but one, like a pole or beam 3 of 25 Modelling Assumptions of a Rod Mass is concentrated along a line; no thickness; rigid (no bending) 4 of 25 Lamina Object with area but negligible thickness, like a sheet of paper 5 of 25 Modelling Assumptions of a Lamina Mass is distributed across a flat surface 6 of 25 Uniform body Mass is distributed evenly 7 of 25 Modelling Assumptions of a Uniform Body Has a centre of mass - geometrical centre of body 8 of 25 Light object Mass is small compared to other masses, like a string or pulley 9 of 25 Modelling Assumptions of a Light Object Zero mass; tension same at both ends of a light string 10 of 25 Inextensible string A string that does not stretch under load 11 of 25 Modelling Assumptions of a Inextensible String Acceleration is the same in objects connected by taut inextensible string 12 of 25 Modelling Assumptions of a Smooth Surface No friction between surface and any object on it 13 of 25 Modelling Assumptions of a Rough Surface Objects in contact with the surface experience a frictional force if moving 14 of 25 Wire Rigid thin length of metal 15 of 25 Modelling Assumptions of a Wire One-dimensional 16 of 25 Modelling Assumptions of a (Smooth and light) Pulley Pulley has no mass; tension is same either side of the pulley 17 of 25 Bead Particle with a hole in it for threading on a string 18 of 25 Modelling Assumptions of a Bead Moves freely along a wire or string; tension is the same either side of the bead 19 of 25 Peg Support from which a body can be suspended or rested 20 of 25 Modelling Assumptions of a Peg Dimensionless and fixed; can be rough or smooth as specified 21 of 25 Air resistance Resistance experienced as an object moves through the air 22 of 25 Modelling Assumptions of Air Resistance Usually modelled as negligible 23 of 25 Gravity Force of attraction between all objects. Acceleration due to gravity is 9.8ms^2 (unless otherwise stated in question) 24 of 25 Modelling Assumptions of Gravity All objects with mass are attracted towards Earth; gravity is uniform and acts vertically downwards 25 of 25

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