Tensile strength of plant fibers (8)

Question 1

Define tensile strength:

Answer 1

The force the fiber can withstand before breaking

Question 2

Suggest how structure of sclerenchyma fibers make them useful for making rope

Answer 2

Thick walls contain lignin that strengthens structure and makes it waterproof
Flexible meaning it doesn’t break easily

Question 3

Devise a valid investigation to determine the effect of storage temperature on the tensile strength of manila rope and nylon rope:

Answer 3

1)Ensure the length and diameter of rope are the same, as well as relative humidity
2)Store at 5 different temperatures (e.g. 16,18,20,22,24 C)
3)Apply weights until rope breaks
4)Calculate change in tensile strength

Question 4

Control variables:

Answer 4

-Length and width of fibers
-Temperature and moisture
-Time given before fiber breaks
-Size of masses added