A series of activities to build up intuition on the mathematics of friction.

In this short problem we investigate the tensions and compressions in a framework made from springs and ropes.

How high will a ball taking a million seconds to fall travel?

Gravity on the Moon is about 1/6th that on the Earth. A pole-vaulter 2 metres tall can clear a 5 metres pole on the Earth. How high a pole could he clear on the Moon?

Which parts of these framework bridges are in tension and which parts are in compression?

Whirl a conker around in a horizontal circle on a piece of string. What is the smallest angular speed with which it can whirl?

See how little g and your weight varies around the world. Did this variation help Bob Beamon to long-jumping succes in 1968?

Invent shapes with different numbers of stable and unstable equilibrium points

A collection of problems related to the mathematics of fundamental physics.