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Friction and its issues.

Extracts from this document...

Introduction

Eni Ballauri

9A

March 2nd, 2007

Physics

Friction

‘Friction is the force that resists the motion of one surface relative to another with which it is in contact.’[1] Friction has three main kinds. Firstly, the sliding or kinetic friction, which is produced by sliding two surfaces across each other [2]. A good example is when we walk. Secondly, the rolling friction, which is resistance produced when a rolling body moves over a surface [2]. For instance, a bicycle moving in the street. Thirdly, the fluid friction or viscosity is the friction between fluids or a fluid and a solid. [2] An example for fluid friction is the boat moving in the water.

Without friction our life would definitely change. For instance, if there was not any friction between the lead of the pencil and the paper, we would not be able to write.

Middle

[3] Friction is a force, and without friction we would stay still, or we would move in a straight line with the same velocity without ever stopping.

On the other hand, friction may also be a nuisance and many times is needed to be reduced. For example, while ice scatting or skiing, friction is a nuisance. Even though there is a sliding motion, there is still some friction between the shoes and the ice. In this case the friction is a nuisance. Also friction occurs when a door, which touches the ground, has to be opened. This requires a big force. Another example of friction is between the bicycle chain and the wheels. In that case friction is required, but it can also be reduced with oil or grease.

Conclusion

n in contact with the car, may damage it by oxidising parts of the car. There are also some special chains for the tyres of cars, which provide friction. So in an ethical consideration, friction is balanced between nuisance and usefulness.

All in all, science has helped us a lot by discovering everything we know for friction. Science has helped up provide friction when is needed, and reduce it as well, even though not totally. Despite this fact, science has also limitations concerning friction issues. Science has not managed to totally reduce friction. We will never be able to know everything about friction and its issues.

(670 words)

Bibliography:

1. Oxford reference “ A Concise Dictionary of Physics” page 104

Oxford New York – Oxford University Press, 1992

1. F  “The World Book Encyclopaedia” page 459

USA – 1992

1. Stephen Pople “Co-ordinated Science Physics”

Oxford University Press Singapore - 1992

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