Model Definitions

?
Particle
Dimensions of the object are negligible
1 of 25
Modelling Assumptions of a Particle
Mass is concentrated at single point; rotational forces and air resistance can be ignored
2 of 25
Rod
All dimensions are negligible but one, like a pole or beam
3 of 25
Modelling Assumptions of a Rod
Mass is concentrated along a line; no thickness; rigid (no bending)
4 of 25
Lamina
Object with area but negligible thickness, like a sheet of paper
5 of 25
Modelling Assumptions of a Lamina
Mass is distributed across a flat surface
6 of 25
Uniform body
Mass is distributed evenly
7 of 25
Modelling Assumptions of a Uniform Body
Has a centre of mass - geometrical centre of body
8 of 25
Light object
Mass is small compared to other masses, like a string or pulley
9 of 25
Modelling Assumptions of a Light Object
Zero mass; tension same at both ends of a light string
10 of 25
Inextensible string
A string that does not stretch under load
11 of 25
Modelling Assumptions of a Inextensible String
Acceleration is the same in objects connected by taut inextensible string
12 of 25
Modelling Assumptions of a Smooth Surface
No friction between surface and any object on it
13 of 25
Modelling Assumptions of a Rough Surface
Objects in contact with the surface experience a frictional force if moving
14 of 25
Wire
Rigid thin length of metal
15 of 25
Modelling Assumptions of a Wire
One-dimensional
16 of 25
Modelling Assumptions of a (Smooth and light) Pulley
Pulley has no mass; tension is same either side of the pulley
17 of 25
Bead
Particle with a hole in it for threading on a string
18 of 25
Modelling Assumptions of a Bead
Moves freely along a wire or string; tension is the same either side of the bead
19 of 25
Peg
Support from which a body can be suspended or rested
20 of 25
Modelling Assumptions of a Peg
Dimensionless and fixed; can be rough or smooth as specified
21 of 25
Air resistance
Resistance experienced as an object moves through the air
22 of 25
Modelling Assumptions of Air Resistance
Usually modelled as negligible
23 of 25
Gravity
Force of attraction between all objects. Acceleration due to gravity is 9.8ms^2 (unless otherwise stated in question)
24 of 25
Modelling Assumptions of Gravity
All objects with mass are attracted towards Earth; gravity is uniform and acts vertically downwards
25 of 25

Other cards in this set

Card 2

Front

Mass is concentrated at single point; rotational forces and air resistance can be ignored

Back

Modelling Assumptions of a Particle

Card 3

Front

All dimensions are negligible but one, like a pole or beam

Back

Preview of the back of card 3

Card 4

Front

Mass is concentrated along a line; no thickness; rigid (no bending)

Back

Preview of the back of card 4

Card 5

Front

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

Back

Preview of the back of card 5
View more cards

Comments

No comments have yet been made

Similar Mathematics resources:

See all Mathematics resources »See all Mechanics resources »