Mechanics - modelling Flashcards
1
Q
Particle
A
- Mass of object is concentrated at a single point.
- Rotational forces and air resistance can be ignored
2
Q
Rod
A
- Mass is concentrated along line
- No thickness
- Rigid - doesn’t bend / buckle
3
Q
Lamina
A
- Mass is distributed across a flat surface
4
Q
Uniform body
A
- Mass concentrated at single point - centre of mass
5
Q
Light object
A
- Treat as having no mass
- Tension same at both ends of a light string
6
Q
Inextensible string
A
- String doesn’t stretch under load
- Acceleration of objects connected to inextensible string is the same
7
Q
Smooth surface
A
- Frictional forces between surface and object are assumed to be zero
8
Q
Rough surface
A
- Objects in contact with surface experience a frictional force if moving or acted on by a force
9
Q
Wire
A
- Treated as 1 dimentional
10
Q
Smooth and light pulley
A
- Pulley has no mass
- Tension is same on either side of pulley
