Drag
Whenever an object moves through the air it experiences frictional forces or drag. Which try to prevent its motion. The faster the object moves, the greater the drag. To reduce these forces objects such as cars, trains and aircrafts are shaped so that they cut through the air. They are streamlined to reduce air resistance.
Animals such as dolphins, sharks and penguins have streamlined shaped so that when they move through the water, frictional forces are as small as possible.
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