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?
A cone is glued to a hemisphere. When you place it on a table in
what position does it come to rest?
In this short problem we investigate the tensions and compressions
in a framework made from springs and ropes.