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Physics Principles

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Archimedes' Principle | Cool Facts | Group Photo | Pascal's Principle | Quiz | Answers
Cool Facts

Archimedes, Bernoulli, Pascal, and Aerodynamics...

*The Heimlich maneuver (pressure applied to a person's abdomen to dislodge something caught in the throat) is an application of Pascal's principle (Merrill, p. 269).
*In applying Pascal's principle, the shape of a container has no effect on pressure (Merrill, p. 269).
*The part of Pascal's principle that states that pressure is applied equally in all directions explains why you feel pressure on your ears while under water whether you are right-side-up, upside-down, or sideways (Merrill, p. 268).
*Archimedes was asked by Hiero II, his king, to determine whether a crown was pure gold or was alloyed with silver. Archimedes was perplexed, until one day, observing the overflow of water in his bath, he suddenly realized that since gold is more dense (i.e., has more weight per volume) than silver, a given weight of gold represents a smaller volume than an equal weight of silver and that a given weight of gold would therefore displace less water than an equal weight of silver. Delighted at his discovery, he ran home without his clothes, shouting "Eureka, which means "I have found it. He found that Hiero's crown displaced more water than an equal weight of gold, thus showing that the crown had been alloyed with silver (or another metal less dense than gold).
*Bernoulli's principle is responsible for the curve in a curve ball. The higher relative speed on one side of the spinning baseball creates a lower pressure, which causes the ball to curve in that direction.
*No matter what reference area is used in the drag equation, the drag force will always be the same in a specific moment.

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