Mechanics: modelling assumptions Flashcards
1
Q
What is/are the modelling assumption/s for a particle?
A
- negligible dimensions
- mass is concentrated at a single point
- rotational forces and air resistance are ignored
2
Q
What is/are the modelling assumption/s for a rod?
A
- mass is concentrated along a line
- no thickness
- rigid (doesn’t bend)
3
Q
What is/are the modelling assumption/s for a uniform body?
A
- mass of the object is concentrated at the object’s geometric centre.
4
Q
What is/are the modelling assumption/s for a light object?
A
- treat as having 0 mass
- tension would be the same both ends of a light string
5
Q
What is/are the modelling assumption/s for a inextensible string?
A
- Two objects connected by an inextensible string have the same acceleration
6
Q
What is/are the modelling assumption/s for a smooth surface?
A
- no friction between the surface and any objects on it
7
Q
What is/are the modelling assumption/s for a rough surface?
A
- objects on it experience a frictional force if they are being acted on by another force, or moving
8
Q
What is/are the modelling assumption/s for a wire?
A
- treated as 1 dimensional
9
Q
What is/are the modelling assumption/s for a smooth and light pulley?
A
- pulley has no mass
- tension is the same either side
10
Q
What is/are the modelling assumption/s for a bead?
A
- moves freely along a wire or string
- tension is the same either side of the bead
