Rowing crew. Early 20th-century photograph of eight rowers and a coxswain rowing on a river. The oars are being used to push against the water, causing the boat to move in the opposite direction across the surface of the water. This is an example of Newton's Third Law, that for every action there is an equal and opposite reaction. To achieve controlled motion, the rowers have to co-ordinate the action of their oars, with the coxswain guiding the boat. These rowers are from the University of Cambridge, UK. The photograph, dating from circa 1911, is from the Bain News Service, one of the USA's earliest news picture libraries.
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