When bicycles were first invented, they had a large front wheel with a large radius. This made them extremely efficient and fast to ride on flat spaces, but unfortunately they were quite unstable and therefore very dangerous to the rider. The center of mass was very high and the bike overturned easily.
Champion Tour de France cyclist Lance Armstrong, like many top cyclists, use technology to improve performance. Lance used a specially designed helmet for time trials. This is an event where maximum efficiency and speed is required. The helmet design helped to shave vital seconds of his time. The helmet minimizes friction by allowing air to flow over his head and down his back. An ordinary helmet would cause turbulent wind flow at his neck and create drag. He also wore specialized clothing to decrease drag.
Physics of goalkeeping
The physics of running
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