... Variables: Independent Variable: number of the blades + angles Dependent Variable: Time to lift weight Controlled Variable: wind speed, the mass of weight, the size of the blade Planning B: Materials: * Windmill tower * 4 detachable wind blades * 0.5m long string * 3 x 10g weights * Hairdryer * Stop watch Method: 1. Collect and prepare all materials and apparatus needed for experiment 2. place built windmill tower on a desk facing the hairdryer 3. hairdryer to desired power 4. hang the weight (0.03kg) from the 0.50m string at the end of the turbine 5. begin with 4 blades at a 30° angle and turn the hairdryer on keeping it at a constant distance from blades, hold blades to prevent them from revolving 6. Let go of the blades and simultaneously start timing the time it takes for the weight to be lifted to the top. 7. repeat this process 5 times 8. after that change the ...

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