Modelling Assumptions Flashcards

1
Q

What are the assumptions about modelling a particle?

A
  • the mass is concentrated at a single point

- rotational forces and air resistance are ignored

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2
Q

What are the assumptions about modelling a rod?

A
  • no thickness
  • the mass is concentrated along a single line
  • rigid (does not bend)
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3
Q

What are the assumptions about modelling a lamina?

A
  • mass is distributed across a flat surface
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4
Q

What are the assumptions about modelling a uniform body?

A
  • the mass is concentrated at a single point at the centre of the body - the centre of mass
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5
Q

What are the assumptions about modelling a light object?

A
  • has zero mass

- tension the same at both ends of the string

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6
Q

What are the assumptions about modelling an inextensible string?

A
  • acceleration is the same in objects connected by a taut inextensible string
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7
Q

What are the assumptions about modelling a smooth surface?

A
  • there is no friction between the surface and any object on it
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8
Q

What are the assumptions about modelling a rough surface?

A
  • 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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9
Q

What are the assumptions about modelling a wire?

A
  • treated as one dimensional
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10
Q

What are the assumptions about modelling a smooth and light pulley?

A
  • pulley has no mass

- tension is the same on either side of the pulley

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11
Q

What are the assumptions about modelling a bead?

A
  • moves freely along a wire or string

- tension is the same on either side of the bead

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12
Q

What are the assumptions about modelling a peg?

A
  • no dimensions and fixed

- can be rough or smooth - is specified in question

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13
Q

What are the assumptions about modelling air resistance?

A
  • modelled as negligible
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14
Q

What are the assumptions about modelling gravity?

A
  • assume that all objects with mass are attracted towards the earth
  • earth’s gravity is uniform and acts vertically downwards
  • g is constant and is taken as 9.8 ms^-1, unless otherwise stated in the question
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