3.4 Materials Flashcards
1
Q
What is Hooke’s Law?
A
Force is directly propotional to extension of a material.
F=kx
2
Q
Define ultimate tensile strength
A
The maximum stress a material can stretch before it breaks.
3
Q
Give 2 examples of polymeric materials.
A
Rubber and Polyethene
4
Q
Give two examples of brittle materials
A
Cast Iron and Glass
5
Q
Define Young’s modulus
A
Stress is directly proportional to strain (within limit of proportionality)
E=stress/strain
6
Q
How do you find the work done by a material?
A
calculate the area under a force-extension diagram
7
Q
What is the condition for Young’s modulus
A
It is within the limit of proportionality
Stress is proportional to strain
