In this assessment, I am going to explore the properties of fishing line which are considered by manufacturers when designing them.1
I am going to be concentrating on the types of fishing line used. I am going to measure the Youngs Modulus of each line to determine their tensile strength and resistance to stretching. In order to do this, I am going to perform an experiment that will measure the YM of each line.
How does it relate to the case study? The results from the experiment will give me an idea of their capability of being useful fishing lines.
Define: Youngs Modulus the stress and strain of a material are proportional to each other. Below this limit, for a particular material, stress divided by strain is a constant. This constant is called the Youngs Modulus.2
If we know the force of the mass being applied on the line, and we know the area of the line, we can calculate the stress. Measure the length of the line, and then perform the experiment to observe the change in length, to get the strain. Thereafter, by using the formula Y.M. = Stress / Strain to calculate the Youngs Modulus. However, there is going to be a percentage error we will have to consider.
A higher Youngs Modulus may mean that a particular line has a higher stiffness; therefore it wouldnt break easily.
Brief Explanation: Stretch a sample of long, thin line across a bench and clamp down one side and dangle down the other side, weighted by a known mass. Place a marker on the line next to a scale. Add more mass, and observe the marker move in order to determine the change in length. Continue until the line breaks. Using the recorded results, determine each lines Young Modulus using the formula.
Fishing Lines and their properties
The 3 main types of line used: braided dacron, monofilament and fluorocarbon.
Braided Dacron: high tensile strength, high resistance to stretching, both wet and dry¦3
Monofilament: one source states that monofilament fishing line due to its chemical properties is stiff with tension.4
Fluorocarbon: ¦dont lose their strength after prolonged immersion in water: as a result they have much less elongation (stretch) under load.5
We must take into consideration that different companies produce varying quality of lines for each type of line; therefore we cannot assume that all are the same.
Fishing has always been a significant practice for countless years. Primitive uses were mainly for hunting fish; making it a means of survival. However, nowadays fishing has become somewhat of a sport,hobby, or to some, a profession. It has become a competitive sport between anglers, where everyone seeks to use the best equipment with the best materials. Environmental fears may be that faulty lines break off into the waters depths, where the hooks are prone to being eaten by other fish, that would kill them. This is a waste of money for the angler, meaning that new equipment would need to be purchased.
The reason why I must perform the experiment in a laboratory, and not outdoors is because I will require a license to do anything related to fishing near any body of open water. Any angler aged 12 years or over, fishing for salmon, trout, freshwater fish or eels in England (except the River Tweed), Wales or the Border Esk and its tributaries in Scotland must have an Environment Agency rod licence.6
* We can test the lines in a dry laboratory, using necessary equipment
* We cannot recreate the actual environment where the lines are going to be utilised
* We cant implement the factor of water being a stimulus on the sample line due to its restriction
* We dont have professional equipment, therefore there will be errors and that would compromise the value of the final Youngs Modulus for each line
1 Edexcel Limited (2008), Briefing Sheet for Young Modulus case study
2 Coordination Group Publications Ltd. (2008), AS-level Physics Edexcel Page 30. , (Researched 10/04/2009)
3 http://www.bartleby.com/65/da/Dacron.html , (Accessed 11/04/2009)
4 http://www.johnston-tackle.com/line-1.htm , (Accessed 11/04/2009)
5 http://members.lycos.co.uk/lureangler/fluoros.htm (paragraph: KNOTS ARE CRITICAL) (Accessed 11/04/2009)
6 http://www.environment-agency.gov.uk/homeandleisure/recreation/fishing/31497.aspx , (Accessed 11/04/09)