### Earth Orbit

Follow in the steps of Newton and find the path that the earth follows around the sun.

### Gravity Paths

Where will the spaceman go when he falls through these strange planetary systems?

### Motorbike Momentum

A think about the physics of a motorbike riding upside down

# Whirlyball

##### Stage: 5 Challenge Level:
You can try this with a conker on a string. It is just motion in a circle with constant angular speed $\omega$. Remember that the acceleration towards the centre is $r\omega ^2$ where $r$ is the radius of the circle. Resolving horizontally use 'force = mass times accelaration'.