tensile fibres

• Describe a valid method that could be used to compare the breaking force of these fibres.

  prepare 3 different fibrous strings per plant type and cut them so they're all the same size

  set up retort clamps and place a box with cushioning inside then tie a fibrous string between each other and place a hook in the middle

  keep adding 10 g masses until string breaks and record mass and find SD repeat the experiment with all variables being the same
• Devise a method to determine the cross-sectional area of a fibre, using the following equipment:

  • a sharp blade: a section of the fibre is cut
  •   a microscope: ensures section is flat
  •   a microscope slide and coverslip: graticule calibrated
  •   an eyepiece graticule: diameter is measured and converted to measurement with calibration data
  •   a stage micrometer: the area is calculated using πr²