mass of the object is concentrated at a single point, rotational forces and air resistance can be ignored
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Model - Rod
all dimensions but one are negligible, like a pole or a beam
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Modelling assumptions - Rod
mass is concentrated along a line, no thickness, rigid
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Model - Lamina
object with area but negligible thickness, like a sheet of paper
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Modelling assumption - Lamina
mass is distributed across a flat surface
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Model Uniform body
mass is distributed evenly
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Modelling assumption - Uniform body
mass of the object is concentrated at a single point at the geometrical centre of the body - the centre of mass
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Model - Light object
mass of the object is small compared to other masses, like a string or a pulley
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Modelling assumption - Light object
treat object as having zero mass, tension the same at both ends of a light string
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Model - Inextensible string
a string that does not stretch under load
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Modelling assumption - Inextensible string
acceleration is the same in objects connected by a taut inextensible string
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Modelling assumption - Smooth surface
assume that there is no friction between the surface and any object on it
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Model - Rough surface
if a surface is not smooth then it is rough
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Modelling assumption - Rough surface
objects in contact with the surface experience a frictional force if they are moving or are acted on by a force
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Model - Wire
rigid thin length of metal
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Modelling assumption - Wire
treated as one-dimensional
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Model - Smooth and light pulley
all pulleys you consider will be smooth and light
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Modelling assumption -Smooth and light pulley
pulley has no mass, tension is the same on either side of the pulley
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Model - Bead
particle with a hole in it for threading on a wire or string
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Modelling assumption - Bead
moves freely along a wire or string, tension is the same on either side of the bead
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Model - Peg
a support from which a body can suspended or rested
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Modelling assumption - Peg
dimensionless and fixed, can be rough and smooth as specified in questions
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Model - Air resistance
resistance experienced as an object moves through air
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Modelling - Air resistance
usually modelled as being negligible
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Model - Gravity
force of attraction between all objects. Acceleration due to gravity is denoted by g.
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Modelling assumption - Gravity
assume that all objects with mass are attracts towards the Earth, Earth's gravity is uniform and acts vertically downwards, g is constant and it taken as 9.8 m, unless stated otherwise in the question
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Other cards in this set
Card 2
Front
Modelling assumption - Particle
Back
mass of the object is concentrated at a single point, rotational forces and air resistance can be ignored
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