Modelling in mechanics

How is a light string used in calculations?

Tension will be equal throughout the string

How is an inextensible string used in calculations?

The acceleration of the two particles will be equal

How is a smooth pulley used in calculations

Tension is the same either side of the pulley

How can we suggest a refinement for g=9.8?

use a more accurate value for g

How can we suggest a refinement for constant resistance?

Have resistance vary with speed

How can we suggest 2 refinements for a particle model?

1. Consider dimensions of the body

2. Take spin into account

How can we suggest a refinement for a smooth object?

Take friction into account

How can we suggest 2 refinements for a light object?

1. Take mass into account

2. Take windspeed/direction into account