20 results found for

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

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

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

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

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

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

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

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

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

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.

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