Maths A level Edexcel Mechanics
Chapter 8 Modelling Questions and
Answers (Solved Papers).
What does it mean if you model something as a particle? - CORRECT ANSWERS It means that
the dimensions of the object are negligible.
What are the assumptions you make when you model something as a particle? - CORRECT ANSWERS
It means the mass of the object is concentrated at a single point. Also means rotational forces and air
resistance can be ignored.
What does it mean if you model something as a rod? - CORRECT ANSWERS It means all
dimensions but one are negligible, like a pole or a beam.
What are the assumptions you make when you model something as a rod? - CORRECT ANSWERS
Mass is concentrated along a line. There is no thickness. And the object in question is rigid.
What does it mean if something is rigid. - CORRECT ANSWERS It means it will not bend or
buckle.
What does it mean if you model something as a lamina? - CORRECT ANSWERS It means the
object has an area but negligible thickness, like a sheet of paper.
What are the assumptions you make when you model something as a lamina? - CORRECT ANSWERS
It means that mass is distributed across a flat surface.
What does it mean when we model something as a uniform body? - CORRECT ANSWERS It
means that mass is distributed evenly.
, What are the assumptions you make when you model something as a uniform body? - CORRECT
ANSWERS Mass of the object is concentrated at a single point of the geometrical centre of the
body- the centre of mass.
What does it mean when we model something as a light object? - CORRECT ANSWERS Mass of
the object is small compared to other masses, like a string or a pulley.
What are the assumptions you make when you model something as a light object? - CORRECT ANSWERS
We treat the object as having zero mass. Tension is the same at both ends of a light string.
What does it mean when we model something as an inextensible string? - CORRECT ANSWERS
A string that does stretch under load.
What are the assumptions you make when you model something as an inextensible string? - CORRECT
ANSWERS We assume that acceleration is the same in objects connected by taut inextensible
string.
What are the assumptions you make when you model something as a smooth surface? - CORRECT
ANSWERS We assume that there is no friction between the surface and any object on it.
What does it mean when we model something as a rough surface? - CORRECT ANSWERS It
means the surface isn't smooth and therefore is rough.
What are the assumptions you make when you model something as a rough surface? - CORRECT
ANSWERS We assume that objects in contact with the surface experience a frictional force if
they are moving or acted on by a force.
What does it mean when we model something as a wire? - CORRECT ANSWERS It means that
the object is assumed to be like a rigid thin length of metal.
Chapter 8 Modelling Questions and
Answers (Solved Papers).
What does it mean if you model something as a particle? - CORRECT ANSWERS It means that
the dimensions of the object are negligible.
What are the assumptions you make when you model something as a particle? - CORRECT ANSWERS
It means the mass of the object is concentrated at a single point. Also means rotational forces and air
resistance can be ignored.
What does it mean if you model something as a rod? - CORRECT ANSWERS It means all
dimensions but one are negligible, like a pole or a beam.
What are the assumptions you make when you model something as a rod? - CORRECT ANSWERS
Mass is concentrated along a line. There is no thickness. And the object in question is rigid.
What does it mean if something is rigid. - CORRECT ANSWERS It means it will not bend or
buckle.
What does it mean if you model something as a lamina? - CORRECT ANSWERS It means the
object has an area but negligible thickness, like a sheet of paper.
What are the assumptions you make when you model something as a lamina? - CORRECT ANSWERS
It means that mass is distributed across a flat surface.
What does it mean when we model something as a uniform body? - CORRECT ANSWERS It
means that mass is distributed evenly.
, What are the assumptions you make when you model something as a uniform body? - CORRECT
ANSWERS Mass of the object is concentrated at a single point of the geometrical centre of the
body- the centre of mass.
What does it mean when we model something as a light object? - CORRECT ANSWERS Mass of
the object is small compared to other masses, like a string or a pulley.
What are the assumptions you make when you model something as a light object? - CORRECT ANSWERS
We treat the object as having zero mass. Tension is the same at both ends of a light string.
What does it mean when we model something as an inextensible string? - CORRECT ANSWERS
A string that does stretch under load.
What are the assumptions you make when you model something as an inextensible string? - CORRECT
ANSWERS We assume that acceleration is the same in objects connected by taut inextensible
string.
What are the assumptions you make when you model something as a smooth surface? - CORRECT
ANSWERS We assume that there is no friction between the surface and any object on it.
What does it mean when we model something as a rough surface? - CORRECT ANSWERS It
means the surface isn't smooth and therefore is rough.
What are the assumptions you make when you model something as a rough surface? - CORRECT
ANSWERS We assume that objects in contact with the surface experience a frictional force if
they are moving or acted on by a force.
What does it mean when we model something as a wire? - CORRECT ANSWERS It means that
the object is assumed to be like a rigid thin length of metal.
