Year 1 Mechanics- Chapter 8: Modelling in Mechanics, Modelling Assumptions

1. ... and ... pulley -All pulleys you consider will be ... and ... Assume the pulley has no mass and tension is the same on either side of the bead (6, 5)
4. ... -Rigid thin length of metal. Assume its treated as one-dimensional (4)
5. ... - Dimensions of the object are negligible. Assume the mass of the object is concentrated at a single point and rotational forces and air resistance can be ignored (8)
9. ... -A support from which a body can be suspended or rested. Assume it is dimensionless and fixed and that it can be rough or smooth as specified in the question (3)

2. ... -Mass of the object is small compared to other masses, like a string or a pulley. Assume the object has zero mass and tension is the same at both ends of a ... string (5, 6)
3. ... -If a surface is not smooth, it is ... Assume objects in contact with the surface experience a frictional force if they are moving or are acted on by a force (5, 7)
6. ... -Particle with a hole in it for threading on a wire or string. Assume is moves freely along a wire or string and that tension is the same on either side of the ... (4)
7. ... -A string that does not stretch under load. Assume acceleration is the same in objects connected by a taut ... (12, 6)
8. ... -Resistance experienced as an object moves through the air. Assume its usually modelled as being negligible (3, 10)
10. ... Assume that there is no friction between the surface and any object on it (6, 7)

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