Modelling Flashcards

1
Q

Particle assumption

A
  • mass of the object is concentrated at a single point

- rotational forces and air resistance can be ignored

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2
Q

Rod assumption

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

Lamina assumption

A
  • mass is distributed across a flat surface
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4
Q

Uniform Body assumption

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

Light Object assumption

A
  • treat object as having zero mass

- tension the same at both ends of a light string

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6
Q

Inextensible String assumption

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

Smooth Surface assumption

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

Rough Surface assumption

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

Wire assumption

A
  • treated as one dimensional
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10
Q

Smooth and Light Pulley

A
  • pulley as no mass

- tension is the same on either side of the pulley

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11
Q

Bead assumption

A
  • moves freely along a wire or string

- tension is the same on either side of the bead

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12
Q

Peg assumption

A
  • dimensions are fixed

- can be rough or smooth as specified in the question

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13
Q

Air Resistance assumption

A
  • usually modelled as being negligible
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14
Q

Gravity assumption

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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