Elastic Behavior/ Deformation Flashcards
What is Hooke’s law?
The extension of a spring is directly proportional to the force applied.
What is the equation representing Hooke’s law?
force = spring constant × extension
What is deformation?
The changing shape or size of an object as a result of forces being applied.
Springs behave elastically when a force is applied.
What is meant by elastic behaviour?
The spring will return to its original length when the force is removed.
Suggest two properties that should be the same for each spring: (2 marks)
1.
2.
- Spring constant.
- Original length.
Elastic deformation is reversed when the force is removed.
Inelastic deformation is not ________________ when the force is removed - there is a ______________________________.
fully reversed
permanent change in shape
What is extension?
The increase in length.
What is compression?
The decrease in length.
What is the limit of proportionality?
When Hooke’s law is no longer applicable.
The spring is stationary and has been stretched beyond its limit of proportionality.
- Now the upward force on the spring is _______ to the ___________________________.
- The spring is ___________________________.
equal
downward force
inelastically deformed
What is the limit of proportionality?
The point beyond where Hooke’s law is no longer true when stretching a material.
What is the elastic limit?
The furthest an object can be deformed while being able to return to its previous shape.
Once a material has gone past its elastic limit, what happens?
Its deformation is now inelastic.
In force-extension graphs:
Linear extension and elastic deformation can be seen _________ the limit of proportionality.
Non-linear extension and inelastic deformation can be seen __________ the limit of proportionality.
below
above
The spring constant is a measure of the ______________ of a spring up to its _____________________________.
stiffness
limit of proportionality
