Target: Primary 4 students
Teachers provide different kinds of material for students to make pinwheels by themselves.
Teacher: Students, what kinds of material do you think are most suitable for making pinwheels? (1)
Students：Any possible answers such as paper, plastic, card board, wood, metal and so on.
Teacher: Imagine we have found the material that we all believe is most appropriate for making pinwheels. What is the most ideal shape of the pinwheel in order to make its rotation faster? (2)
Students: Any possible answers such as cross-shaped, star-shaped or Bauhinia-shaped.
Teacher: What is the relation between the shape of a pinwheel and its surface area? What is the relation between the surface area of a pinwheel and its rotation speed? (3)
Teacher: How can you apply your discovery to your daily life? (4)
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