This reduces the amount of friction, known as air resistance. If the jet's nose was square, the air wouldn't flow as easily. Resistance would increase and the jet wouldn't be able to fly as fast. Race cars are also streamlined to reduce air resistance. While submarines are streamlined to reduce water resistance. Gannets Gannets are Europe's largest seabirds. They feed on fish that live deep below the ocean surface. Now you might not think the gannet's body is well—suited for fishing.
Its wings should create a lot of resistance as the bird tries to dive underwater. But the gannet has a clever solution. You can see the same thing with water friction. Water moves past a moving boat. If there wasn't any water friction, the boat would travel much faster. An example of where we see air friction is in a vehicle. A sports car is long and smooth - streamlined. The air can slide over it quickly. In a more flat-fronted vehicle like a truck there is much more air friction.
Machinery has to be lubricated to prevent its moving parts from wearing out due to friction. Most machines are oiled or greased when they are made and are lubricated from time to time as they are used. When objects move, the air around them generates a type of friction called air resistance, or drag, that slows them down. Fast-moving objects such as cars, trains, and aeroplanes are all streamlined? This helps them to move faster and use less fuel.
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