Teacher sheet · Ages 10–11 · about 45–50 minutes
How birds fly
Lesson page: echoesof.science/school/birds/ages-10-11/ · Pupil worksheet: echoesof.science/school/birds/ages-10-11/print/
Learning aims
- Describe the structure of a feather.
- Explain the jobs of primary, secondary, tail and down feathers.
- Explain lift in terms of faster air and lower pressure, and that lift grows with wing size and speed.
- Plan and carry out a fair test with repeats.
Lesson plan
| Time | Activity |
|---|---|
| 5 min | Starter: why can't people fly by flapping their arms? |
| 10 min | Read the text; label a feather. |
| 25 min | Paper strip and glider fair test. |
| 5 min | Which feather? game. |
| 5 min | Quiz and results discussion. |
Materials for the experiment
- Strips of paper about 4 cm × 20 cm
- A4 paper
- Scissors (adult help), tape, paper clips
- Tape measure
- A clear space such as a hall
Safety: Launch gliders in one direction only, never towards people's faces. Keep the flight path clear. An adult helps with scissors.
Common misconceptions
| Pupils may think… | Actually… |
|---|---|
| Air over the top of a wing must 'catch up' with air under it. | That idea is wrong; the wing turns the air, and the faster air above has lower pressure. |
| Birds fly just by flapping. | Wing shape and feathers make lift; flapping gives the forward push. |
| Bird bones are weak because they are hollow. | Struts inside keep hollow bones strong. |
Worksheet answers
- Shaft down the middle; vanes on each side; barbs as the branches of the vanes.
- The wing turns the air; the air above the wing moves faster, faster air has lower pressure, so the higher pressure below pushes the wing up.
- Changed: wing size. Measured: distance flown. Same: paper, paper clip, launch height and force, launch line.
- Any two: hollow bones with struts; a light beak instead of jaws and teeth; light feathers.
Quiz answers
- What holds the barbs of a feather together? Tiny hooks on the barbules. Barbules hook the barbs together.[4]
- Which feathers push a bird forward? The primary feathers at the wing tip. Secondaries give most of the lift.[4][1]
- What do tail feathers do? Steer and act as a brake. They work like a rudder and a brake.[4]
- Why does a paper strip rise when you blow over it? Fast air above it has lower pressure. Faster air has lower pressure.[9]
- Which change gives a wing more lift? A bigger wing moving faster. Lift grows with wing area and speed.[6]
- How is a bird's skeleton made light? Many bones are hollow with thin struts. Struts keep hollow bones strong.[1]
Going further
Watch a pigeon or gull for a few minutes. Does it flap all the time, or glide? Record how many times it flaps in 10 seconds.
Sources used in this lesson
- [1] Biology 2e, 29.5 Birds (OpenStax (Rice University)): reliability High
- [4] Feathers and flight (Science Learning Hub, University of Waikato (New Zealand)): reliability High
- [5] If a bird lost all its feathers, could it still fly? (Smithsonian National Air and Space Museum (How Things Fly)): reliability High
- [6] The lift equation (student activity) (NASA Glenn Research Center): reliability High
- [7] Incorrect lift theory: equal transit (NASA Glenn Research Center (Beginner's Guide to Aeronautics)): reliability High
- [9] How do birds fly? (Ask A Biologist, Arizona State University): reliability Medium-high
Full list with links and a note on each source's reliability: echoesof.science/school/birds/sources/
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