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# To study the factors, which affect the way in which wind vanes can be used to control the rate at which a weight falls.

Extracts from this document...

Introduction

KS3 Physics Practical – Wind Vanes

Introduction: A Typical Wind vane

Wind turbine generators are increasingly used as alternative sources of electricity generation. They are much less harmful to the environment than other sources of energy, but are not always practical because they require average wind speeds of at least 21 km/h (13 mph).

Properly placed wind turbines can generate electric power anywhere the wind blows steady and strong.

Wind turbines use the momentum of moving air to quietly turn large blades that are attached to the shaft of an efficient electric generator

Aim:

To study the factors, which affect the way in which wind vanes can be used to control the rate at which a weight falls.

Prediction:

A fan creates air resistance. If one fan creates air resistance, then more fans would create more drag. This is because with more air hitting the fans, more drag is created. Another way to make more air hit the fans is to increase the surface area of the fans. More drag means that it is harder for the wind vane to push the air around, so the wind vane will rotate slower.

Fair Test:

Middle

Attach to the end of the string a weight of fifty (50g) grams.Cut out cards of different lengths accurately. Slot in the shortest piece of card in to the cork.Take a stopwatch and time how long it takes for the weight to drop to the desk.

10.Repeat this procedure for the pieces of card with different

lengths.

11.Record the timings into a results table. From this produce a

line graph.

Variables:

 Controlled Variables Independent Variables Dependant Variables Length of string Length of fan Time taken for weight to hit the desk Weights added

Conclusion

As we gradually changed the length of the card to longer size, we noticed that the timings also increased making rotation slower. We also noticed that the weights further helped slower the rotation of the fan.

Evaluation:

I think that we have answered the question that we set out to find out at the start of the investigation, as we investigated factors, which affect the way in which wind vanes can be used to control the rate at which, a weight falls.

Yes, our experiment was fair as we only had two variables the length of the string and the weights. Everything else in the fair test was carried out consistently.

The improvements that I would make if I were to redo the experiment would be to do the experiment for a third time and to use a data logger if possible to get the most accurate reading. I would keep everything else the same.

The results were as accurate as they could get. To make it more clear we decided to get an average. The results came out as expected are evident enough to make a firm evaluation that if one fan creates air resistance, then more fans would create more drag enabling wind vanes to work effectively.

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