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Design an experiment, that investigates how horizontal wind speed affects the angle of deflection from the vertical, of a hanging board.

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Introduction

Aim: To design an experiment, that investigates how horizontal wind speed affects the angle of deflection from the vertical, of a hanging board.

Wind is the net movement of air particles caused by changes in atmospheric pressure. It can be reproduced using a fan, which uses an electric motor to cause fan blades to rotate, and the air behind is sucked and pushed through to create wind. A fan is therefore ideal apparatus to use to produce wind, and be used within this experiment.

For the purpose of this experiment, wind speed is the independent variable, and therefore it is required that this can be varied accordingly. In order to increase wind speed in a fan, the fan blade rotation must increase.

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Middle

There are a number of factors that need to be considered in detail to ensure that accurate and reliable results are obtained from this experiment. Primarily, the way wind is produced by the fan needs to be observed. The fan blades cut through the air as it rotates, and due to this the wind speed varies slightly. On using the fan facing the hanging board, this would cause the board to flicker, practically making the angle of deflection difficult to measure. However, this problem can be overcome by facing the back of the fan towards the board. The suction of air through the back of the fan can imitate the smoothness of natural wind, and

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Conclusion

to be hanging freely, and this can be achieved by attaching the board to a clamp and stand with sellotape.

Diagram:

Method

1. Set up the apparatus as shown in the diagram. Ensure that the protractor is attached so that the board hangs at 90°.

2. Set the fan to its first wind speed, and record the wind speed displayed on the digital anemometer.

3. Wait for the hanging board to take a deflected position, and measure this angle of deflection from the vertical.

4. Repeat steps 2 and 3 with all other fan speed settings.

5. Repeat step 2 – 4 twice so that overall three sets of results are obtained.

References:

http://www.davisnet.com/weather/products/weather_product.asp?pnum=7911

http://www.inlec.com/view_product.php?product=185&PHPSESSID=ea3ce460d610af65e51bfc1813f116b6

http://home.howstuffworks.com/vacuum-cleaner3.htm

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