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 simplified account of special relativity and the twins paradox.
A ball whooshes down a slide and hits another ball which flies off
the slide horizontally as a projectile. How far does it go?
The laws of physics involve certain fundamental constants of nature.
The key constants which the universe knows about are:
What values would these constants have taken in the days of the British Empire, when units of feet (ft) for length, pounds (lb) for weight, calories (cal) for heat and degrees Fahrenheit (F) for temperature, were used?
You may use these conversions:
What units would you need to choose so that the first three constants take the value 1?
These are the natural length, mass and time scales for the universe.