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Earth Orbit


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Gravity Paths


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Motorbike Momentum

A think about the physics of a motorbike riding upside down


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'.