#### Longboard physics

A few (surprising?) thoughts on how the wheels on a longboard or skateboard actually move.

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Jonathan describes his adventures with a longboard and some different methods of making a speedometer for it.

More details | Watch now#### Oscillations

Inertia and restoring forces can, with low friction or damping, lead to oscillations and resonance. We analyse the mechanics of vibrations.

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The inverse square law explains planetary motion - and apples falling. Newton's law, measuring G, calculating orbits.

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Torques produce angular acceleration, moment of inertia 'resists' it. Rotational kinetic energy and angular momentum.

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p=mv. If external forces are zero, momentum is conserved. In collisions, energy may be conserved (elastic) or not (inelastic).

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In finite objects, the total external force equals the total mass times the acceleration of a point called the centre of mass.

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The total work done on an object equals the increase in its kinetic energy. For conservative forces, we can define potential energy.

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A short video showing a simple classroom method of checking the way in which this force is related to mass, speed and radius.

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A presentation showing both the ideas about centripetal force and a simple classroom method of checking the way in which this force is related to mass, speed and radius.

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Carefully distinguish mass and weight. Hooke's law quantifies deformation. Contact forces have normal and frictional components.

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