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A LEVEL - Maths > Mechanics > Flashcards

Mechanics Flashcards

1
Q

What are some modelling assumptions of a particle?

A
  • Mass of object is concentrated at a single point

* Rotational forces and air resistance can be ignored

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2
Q

What are some modelling assumptions of a rod?

A
  • Mass is concentrated along line
  • No thickness
  • Rigid
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3
Q

What is a lamina?

A

Object with area but negligible thickness, like a sheet of paper.

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4
Q

What are some modelling assumptions of a lamina?

A

• Mass is distributed across a flat surface

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5
Q

What are some modelling assumptions of a uniform body?

A

• Mass of object is concentrated at a single point at the geometrical centre of the body (centre of mass)

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6
Q

What are some modelling assumptions of a light object?

A
  • Treated as having 0 mass

* Tension the same at both ends of a light string

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7
Q

What are some modelling assumptions of an inextensible string?

A

• Acceleration is the same in objects connected by a taut inextensible string

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8
Q

What are some modelling assumptions of a smooth surface?

A

• No friction between the surface and any objects on it

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9
Q

What are some modelling assumptions of a rough surface?

A

• Objects in contact with the surface experience a frictional force if they are moving ot are acted on by a force

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10
Q

What are some modelling assumptions of a wire?

A

• Treated as one dimensional

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11
Q

What are some modelling assumptions of a smooth and light pulley?

A
  • Pulley has no mass

* Tension is the same on either side of the pulley

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12
Q

What is a bead?

A

Particle with a hole in it for threading on a wire or string.

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13
Q

What are some modelling assumptions of a bead?

A
  • Moves freely along a wire or string

* Tension is the same on either side of the bead

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14
Q

What is a peg?

A

A support from which a body can be suspended or rested.

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15
Q

What are some modelling assumptions of a peg?

A
  • Dimensionless and fixed

* Can be rough or smooth as specified in the question

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16
Q

What are some modelling assumptions of air resistance?

A

Usually modelled as being negligible.

17
Q

What are some modelling assumptions of gravity?

A
  • Assume all objects are attracted towards the Earth
  • Earth’s gravity is uniform and acts vertically downwards
  • g is constant and is taken as 9.8m/s^2 unless otherwise stated
18
Q

What is the normal reaction?

A

The force which acts perpendicular to a surface when an object is in contact with the surface.

19
Q

What is thrust or compression in a rod?

A

The force acting on the object when it is being pushed along by a light rod.

20
Q

What is buoyancy?

A

The upward force on a body that allows it to float or rise when submerged in liquid.

A LEVEL - Maths (4 decks)

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