hello everyone! so as the title suggest, i wonder if anyone would have any idea to design a simple experiment to determine the bending strength and torsion of a plastic ruler. it doesnt need to be extensive, as the value of the strenght itself isnt important. i just wanna know e.g how far could the ruler bend before breaking. and when i have the result, i could compare it with another plastic ruler. I dont have any measuring devide, all i have is a protractor and ill have some way of determining the angle of bend. (i also have a dynamometer if that would help in any way) here is my suggestion of the bending strength experiment: [Broken] http://imageshack.us/a/img199/3729/vj0e.png [Broken] for this experiment i jsut put the ruler on the table and apply F at the end and determine the angle. Although it is actually pretty inaccurate to read the angle to determine its strengh :/ and here another suggestion: [Broken] http://imageshack.us/photo/my-images/9/rjkx.jpg/ i put the ruler on 2 objets and apply F to the middle part.ill determine how far will it bend in cm. Do you guys have any suggestion for this experiment? as i said, i have limited device and i would prefer an experiment as simple as possible. Also, i would be needing a design experiment to determine the torsion of the plastic ruler too. Alhthough i dont really know how to do it without proper measuring devide :/ So i would appreciate if anyone could give an idea about it! Thank you!