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Two is too few, four is too many, but three is just perfect. Individuals watch a Real Engineering video to see why wind turbines typically have three blades. This requires consideration of both cost and speed of blade rotation.
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Instructional Ideas
- Take a field trip to a wind turbine farm if possible
Classroom Considerations
- Scholars should have familiarity with torque
- Pupils must be able to interpret graphs
- This video is hosted on YouTube
Pros
- Graphics aid with understanding
- Explanations are descriptive and informative
Cons
- None