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When the distance between the supports increased the sag also increased, but not in a proportional way. Were it not for this property it would be impossible to dry wood without destroying completely its cohesion, due to the irregularity of shrinkage. I will use a longer nail so that the rule will be kept further away from the table, this should eliminate friction through rubbing.
Meter Ruler — SmartLabs Meter Ruler — SmartLabs
I am very pleased with the results I gained because they had shown me a good trend/pattern which I could refer to. The nail used to go through the holes was not small enough and could have caused friction between the nail and the material causing it to slow down.I could have improved my procedure for this experiment by using more accurate equipment such as right angle triangle rulers. I will make sure the horizontal ruler is straight and not bent as this would cause readings to be read incorrectly. They are prevalent is particular fields of study including geometry, printing, technical drawing, architecture, building and engineering. One Newton weight will be hung around the string and the difference between the original and new deflection will be taken, then a second weight will be added and the new total deflection measured. When the rule was swinging, it sometimes rubbed the side of the table causing the rule to slow down.
Rulers | Engineering Ruler | Metal Rulers | RS Rulers | Engineering Ruler | Metal Rulers | RS
It would be more functional to have ( dare I say it ) clear plastic ends so that the markings were clearly visible or just add a few more cm onto each end of the ruler so that the markings are not concealed by the metal ends. To make sure that I do not move when I am taking the readings so that I get the correct results as much as possible. After this limit has been exceeded, the size and shape of the specimen after removal of the load will not be the same as before, and the difference or amount of change is known as the ~permanent set~.
However, I have to ensure that all the equipment is set up properly and that all things are clamped or tied together.
Wood Metre Ruler - Etsy UK Wood Metre Ruler - Etsy UK
I could have repeated the experiment several times and drawn an average; this would have helped me get more accurate results. Knowledge of these properties is obtained through experimentation either in the employment of the wood in practice or by means of special testing apparatus in the laboratory. Firstly I shall get a nail and based on the size of it, drill holes into the meter rule so that it fits easily and properly. So the best way to resolve this will be to pay as mush attention to the experiment in action as possible.Nice to have metal ends so the wood can't split but the metal conceals the first centimetre and a half and the last 1+1/2 . These materials are hard wearing and are usually shatter resistant and scratch proof as they are made to last a long time.
Wooden Metre Ruler - Etsy UK
As you can see, my graph produced a curve and this was due to the bonds in the wooden rule reaching it elastic limit. Rulers are used everywhere, from schools and offices to within the home and in a wide range of occupations. If the rule was securely glued together they would no longer slip, but the tendency to do so would exist just the same.The length of the rule may not have been exactly correct, as all I did was lay it on the table therefore it could have moved when I was adding weights or not been place accurately. Lead and moist clay are nearly plastic and wood possesses this property to a greater or less extent. This has centimetres/ millimetres and inches clearly marked, it has a fair depth to it so it's not at all flimsy and, helpfully, a little hole (like quilting templates have) so it can be hung up. In practice the elastic limit of a material under test is determined from the stress-strain diagram.
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