Construct pinwheels with varying numbers of blades to investigate how blade count influences spin speed. This project demonstrates the relationship between design and motion.
If the number of blades on a pinwheel increases, then the spin speed will change when placed in front of a fan.
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Cut paper squares for the pinwheel blades.
Create pinwheels with 2, 3, 4, 5, 6, 7, and 8 blades.
Attach each pinwheel to a wooden stick using a push pin.
Set up a fan to provide a consistent airflow.
Hold each pinwheel in front of the fan and observe the spin speed.
Use a stopwatch to measure how fast each pinwheel spins.
Record your observations for each pinwheel.
Analyze which blade count results in the fastest spin.
Pinwheels with a moderate number of blades will likely spin faster compared to those with very few or too many blades. The optimal number of blades balances air resistance and speed.
Number of blades on the pinwheel
Spin speed of the pinwheel
Size of the blades, Material of the pinwheel, Airflow from the fan
Ensure the fan is stable and keep fingers away from the moving pinwheel.
Show each type of pinwheel and explain their differences.
Use a graph to display the spin speeds of different pinwheels.
Discuss why certain configurations might be more efficient.
More blades can increase air resistance, affecting how fast the pinwheel spins.
Yes, but keep the material consistent across tests for accurate results.
Check that the pinwheel is balanced and the fan provides enough airflow.
