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The clip starts with a demonstration of the effect of water. Water weighs around 1kg per litre. The annual rainfall of England’s wettest place, Borrowdale in the Lake District, is placed into the bucket of a machine. This is then dropped onto a car, crushing it. Opportunity to discuss how rainfall is measured – comparing this to local annual rainfall.

Clip then moves on to demonstrate the effect of air resistance on raindrops. Richard builds a series of sand castles at the base of a tower in Bristol. When water is dropped from waist height the sandcastle is crushed. When dropped from height (30m), the water has less effect. Animated explanation of air resistance.