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Explain why, when moving heavy objects on rollers, the object moves twice as fast as the rollers. Try a similar experiment yourself.

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Maximum Flow

Given the graph of a supply network and the maximum capacity for flow in each section find the maximum flow across the network.

Moving Stonehenge

Stage: 5 Challenge Level: Challenge Level:1

Archimedes' Principle says that when you displace some volume of fluid, you experience an upward force equal to the weight of the fluid displaced.

The problem boils down to finding out how much weight a metre of log can support.

Many physics A-Level syllabuses cover Archimedes' Principle, which is covered in more depth in most 1st year general engineering courses.