Question 4
The diagram above is graph of load against extension for a wire under varying tension. Identify the:
- Segment in which Hooke’s law is obeyed;
- Segment where elasticity holds;
- Yield point.
Observation
Most candidates failed to recognize the unlabeled origin of a given graph as a necessary starting point for parts (a) and (b). for instance, the origin to point A for segment (a) and origin to point B for segment (b)
The expected answers
- (a) Segment in which Hooke’s law is obeyed
The straight line
(b) Segment where elasticity holds
The straight line plus AB
(c) Yield point