Unit 2 - Materials Flashcards
0
Q
Explain the meaning of the term plastic deformation. (1)
A
Permanent deformation/ permanent extension
Doesn’t return to original length
1
Q
State Hooke’s law. (2)
A
- Force proportional to extension
* Up to the limit of proportionality
2
Q
Two identical springs are in parallel and series. Which arrangement stores more energy. (3)
A
- Series greater
- Extension greater in series and force is same
- Energy proportional to extension (E=0.5FΔL)
3
Q
With reference to a spring, explain what is meant by limit of proportionality. (1)
A
(Any one)
• Limit of Hooke’s law
• Force no longer proportional to extension
• Graph is no longer linear
4
Q
State Hooke’s law. (2)
A
- Force is proportional to extension
* Up to limit of proportionality
5
Q
State what features of a load-extension graph confirm that a spring obeys Hooke’s law. (2)
A
- Straight line
* Through origin
