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?
Whirl a conker around in a horizontal circle on a piece of string.
What is the smallest angular speed with which it can whirl?
In this short problem we investigate the tensions and compressions
in a framework made from springs and ropes.