![Phase space](/sites/default/files/styles/medium/public/thumbnails/content-id-7107-icon.png?itok=80oDL5Ev)
Newton's laws of motion
![Phase space](/sites/default/files/styles/medium/public/thumbnails/content-id-7107-icon.png?itok=80oDL5Ev)
![Whirlyball](/sites/default/files/styles/medium/public/thumbnails/content-id-4756-icon.jpg?itok=RWIlrEU4)
problem
Whirlyball
Whirl a conker around in a horizontal circle on a piece of string.
What is the smallest angular speed with which it can whirl?
![Modelling Assumptions in mechanics](/sites/default/files/styles/medium/public/thumbnails/content-id-6631-icon.jpg?itok=1ZiTiiz4)
article
Modelling Assumptions in mechanics
An article demonstrating mathematically how various physical
modelling assumptions affect the solution to the seemingly simple
problem of the projectile.