Modelling assumptions Flashcards

1
Q

particle

A

dimensions of object are negligible
mass of object conc. at single point
rotational forces + air resistance ignored

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2
Q

rod

A

all dimensions but one negligible (like pole)
mass con. along line
no thickness
rigid (can’t bend/buckle)

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3
Q

lamina

A

area but negligible thickness (paper)

mass distributed across a flat surface

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4
Q

uniform body

A

mass is distributed evenly

mass of object conc. at single point at geometrical centre of body (centre of mass)

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5
Q

light object

A

small mass (like string/pulley)
treated with zero mass
same tension at both ends of light string

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6
Q

inextensible string

A

string that doesn’t stretch under load

acceleration same in objects connected by taut inextensible string

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7
Q

smooth surface

A

assume no friction between surface and objects in contact

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8
Q

rough surface

A
not smooth (lol)
objects while moving in contact will experience frictional force
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9
Q

wire

A

rigid thin length of metal

treated as 1D

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10
Q

smooth and light pulley

A

all pulley considered smooth and light
no mass
tension same on either side of pulley

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11
Q

bead

A

particle with hole in it for threading with wire/string
moves freely along wire/string
tension same on either side of bead

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12
Q

peg

A

a support from which a body can be suspended or rested
dimensionless
fixed
can be rough or smooth (specified)

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13
Q

air resistance

A

resistance experienced as inject moves through air

negligibility specified in question

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14
Q

gravity

A

force of attraction between all objects
acceleration due to gravity denied by g
assume all objects with mass attracted towards Earth
Earth’s gravity uniform and acts vertically downwards
g = 9.8m s^-2 unless stated otherwise

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