Models and modelling assumptions 5.0 / 5 based on 1 rating ? MathematicsMechanicsASEdexcel Created by: emilyindiagreenCreated on: 16-09-18 16:11 Model Modelling Assumption 1 of 15 Particle - dimensions are negligible Rotational forces and air resistance are ignored. The mass is concentrated in one place 2 of 15 Rod - only 1 dimension is important (rod or beam) No thickness. Mass in concetrated along line. Rigid 3 of 15 Lamina - area but negigble thickness (sheet of paper) Mass distributed across surface 4 of 15 Uniform body - mass is distributed evenly Mass is concetrated at a single point at the centre (centre of mass) 5 of 15 Light Object - mass is small compared to other objects (string, pulley) Object has ZERO mass. Tension is equal both ends of a light string. 6 of 15 Inextensible sting - a string that doesn't stretch under a load. The ACCELERATION is the same in both objects connected by a taut, inextensible string. 7 of 15 Smooth surface Friction between object and surface is ingnored. (assume there isn't any) 8 of 15 Rough Surface There IS friction between the surface and objects on it when they are moving. 9 of 15 Wire - rigid thin length metal Treated as 1 dimensional 10 of 15 Smooth and light pulley - ALL pulleys you consider will be like this. Pulley has no mass. Tension is the same on either side of the pulley. 11 of 15 Bead - particle with a hole on for threading on a string or wire Moves freely along the wire. Tension is the same on either side of the bead. 12 of 15 Peg - a support which a body can be rested or suspended from Dimensionless and fixed. Rough or smooth (said in question) 13 of 15 Air Resistance Normally negibible 14 of 15 Gravity - force of attraction between all objects. Acceleration of objects due to gravity is "g" "g" is constant and 9.8 m/s^2. All objects with mass are attracted to Earth. Earth's gravity is uniform and acts verically downwards. 15 of 15
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