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The Physics of Bird Flight 5 th Grade
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Objectives: To explain how a bird is able to fly To identify three types of flight that birds use.
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Did you know? All objects on land are surrounded by an invisible ocean of air. Air = a mixture of gas molecules that exert pressure on the objects they surround.
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Air Pressure: When you blow into a balloon, it gets larger The pressure of the air molecules pushing on the sides of the balloon make it expand
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Air Pressure: How does it work?
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Air Pressure The faster air moves, the less pressure it exerts
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Movement and Air Pressure For birds, fast-moving air above the wing exerts less pressure Slower-moving air below the wing exerts more pressure
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Higher pressure keeps the bird in flight
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A bird’s angle and shape of the wing causes the air to move faster above the wing than below it
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Lift: an upward force that causes a bird to rise based on the difference in pressure above and below the wings as a bird moves through the air
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What does a bird do to get off of the ground before it uses lift to fly?
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To get into the air…. A bird moves forward to make air move over its wings A bird sharply pulls down its wing to provide the power that pushes the bird forward
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Once birds are in the air, there are 3 types of bird flight 1) ? 2) ? 3) ?
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Three types of bird flight: 1) Flapping 2) Soaring 3) Gliding
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Flapping: what does that do?
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Flapping All birds flap their wings (sharply pull down their wings) Certain birds rely on flapping more than others
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Soaring Involves little movement Birds use rising currents of warm air Used to move upward
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Gliding Involves little wing movement Birds use falling currents of cool air Used to move downward
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Question: Does Soaring or Flapping take more energy?
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Answer: Flapping…it takes a large amount of energy!
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What do birds use so that they do not need to waste too much energy on flapping?
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They use warm and cool air currents
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Did you know? Warm air rises and cool air sinks
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Remember that to soar, birds use warm air currents so that they can move upward
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Remember that to glide, birds use cold air currents so that they can move downward
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What is a type of flight that we have not yet talked about that doesn’t use any lift?
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Answer: Diving does not use any lift. How do birds use diving to their advantage?
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Diving is used for… Hunting for prey
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What does a bird do with its wings so that it can effectively dive?
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Birds pull their wings in close to their bodies so that there is no more lift The result: gravity pulls them down! Fun fact: Peregrine Falcons can dive up to 300 kilometers per hour
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Peregrine Falcon Diving http://www.youtube.com/watch?v=j3mTPEuF cWk http://www.youtube.com/watch?v=j3mTPEuF cWk
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Bird Flight: This video really helps explain it! http://www.youtube.com/watch?v=3So7OMw Ngy8 http://www.youtube.com/watch?v=3So7OMw Ngy8
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