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Breaking Investigation

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Introduction

An airbrake is a device using air resistance (air friction) to slow down an object. An airbrake is a very efficient way of braking, which is why it can be found in devices such as trains, lifts, hoists, etc. THE TASK The task is to investigate what effects the degree of braking, how your chosen factor(s) is/are related and why you think it/they effect the braking in this/these way(s). METHOD The air brake was made up using a knitting needle, glass tubing, a cork with slits, and 8 (8cm x 3cm) cardboard blades. As you can see in the diagram below, the knitting needle acts as an axle, which allows the glass tube to move freely. To the glass tube we attached a string which was 185cm long. ...read more.

Middle

PREDICTION I think the key factors that could effect my experiment could be the area of the cardboard blades and the force of gravity. I predict that "as more mass is added, the air brake will become less effective". This will happen because as the mass pulls on the air brake and the gravity pushes down, the air brake will slowly become less effective which will lead to trials becoming faster as mass is added. MY RESULTS My results in a graph.... mass Time taken in first trial (s) Time taken in second trial (s) Time taken in third trial (s) Average time for 3 trials (s) 20g 23.37 20.49 20.34 21.41 30g 15.61 14.83 15.32 15.25 40g 14.17 14.13 14.22 14.17 50g 13.07 12.94 13.38 13.13 60g 14.01 12.91 14.58 14.23 70g 12.15 10.96 11.92 11.94 80g 12.28 11.87 11.92 12.02 90g 10.49 10.84 11.33 10.89 My results in a line graph.... ...read more.

Conclusion

We could of also made the string a bit longer so instead of timing it until the mass stopped in mid-air, we could of timed it until the mass hit the ground; This would help the time keeper to get a more accurate result. I think that my decision to keep the cardboard blades the same on the trails and change the mass worked out very well. If we would have changed the blades and kept the mass the same, I think we would have got pretty much the same set of the results. Although the theory for that experiment would have a different saying, something like "as you add more wings, the air brake becomes more effective", it really has the same meaning as our theory but written in a different way. ?? ?? ?? ?? 28/04/07, page 1/2 By Shaminder Singh Juttla ...read more.

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