Kinematics - Topic 7 Flashcards

Use kinematic language, interpret graphs for motion in a straight line, derive formulae, use calculus, and modelling

1
Q

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses a particle?

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

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses a rod?

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

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses lamina?

A
  • Mass is distributed across a flat surface
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4
Q

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses a uniform body?

A
  • 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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5
Q

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses a light body?

A
  • Treat object as having zero mass
  • Tension the same at both ends of a light string
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6
Q

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses an inextensible string?

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

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses a smooth surface?

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

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses 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

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses a wire?

A
  • Treated as one-dimensional
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10
Q

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses 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

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses 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

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses a peg?

A
  • Dimensionless and fixed
  • Can be rough or smooth as specified in question
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13
Q

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses air resistance?

A
  • Usually modelled as being negligible
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14
Q

Year 1 - Chapter 8.2

What modelling assumption is made if the model uses 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 9.8ms⁻², unless otherwise stated in the question
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