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.

Concepts

wind, wind turbines, torque, centrifugal force

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Additional Tags

science

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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