Kinematics - Topic 7 Flashcards
Use kinematic language, interpret graphs for motion in a straight line, derive formulae, use calculus, and modelling
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a particle?
- Mass of the object is concentrated at a single point
- Rotational forces and air resistance can be ignored
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a rod?
- Mass is concentrated along a line
- No thickness
- Rigid
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses lamina?
- Mass is distributed across a flat surface
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a uniform body?
- Mass of the object is concentrated at a single point at the geometrical centre of the body - the centre of mass
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a light body?
- Treat object as having zero mass
- Tension the same at both ends of a light string
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses an inextensible string?
- Acceleration is the same in objects connected by a taut inextensible string
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a smooth surface?
- Assume that there is no friction between the surface and any object on it
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a rough surface?
- Objects in contact with the surface experience a frictional force if they are moving or are acted on by a force
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a wire?
- Treated as one-dimensional
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a smooth and light pulley?
- Pulley has no mass
- Tension is the same on either side of the pulley
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a bead?
- Moves freely along a wire or string
- Tension is the same on either side of the bead
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses a peg?
- Dimensionless and fixed
- Can be rough or smooth as specified in question
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses air resistance?
- Usually modelled as being negligible
Year 1 - Chapter 8.2
What modelling assumption is made if the model uses gravity?
- Assume that all objects with mass are attracted towards the Earth
- Earth’s gravity is uniform and acts vertically downwards
- g is constant and is taken as 9.8ms⁻², unless otherwise stated in the question