Define elastic deformation .

When the load is removed, the object returns to its original length.

Define plastic deformation .

When the load is removed, the object does not return to its original length.

Define the elastic limit .

The point beyond which an object does not return to its original length when the load is removed.

What is the difference between the elastic limit and the limit of proportionality ?

The limit of proportionality is where the material stops obeying Hooke's law The elastic limit is the furthest point a material can be stretched and still return to its original shape The elastic limit occurs at a slightly higher extension than the limit of proportionality

How can brittle and ductile materials be distinguished on a stress-strain graph?

A brittle material shows a straight line through the origin with no or negligible curve A ductile material shows a straight line through the origin, then curves towards the x-axis

.......... materials, such as rubber and copper, have a large plastic region and stretch into a new shape before breaking.

Ductile materials, such as rubber and copper, have a large plastic region and stretch into a new shape before breaking.

True or False? A brittle material undergoes significant plastic deformation before it breaks.

False. Brittle materials break with little elastic and insignificant plastic deformation.

Define elastic potential energy .

The energy stored within a material (e.g. a spring) when it is stretched or compressed .

How is the work done in stretching a material found from a force-extension graph?

Work done is equal to the area under the force-extension graph .

How is the area under a force-extension graph calculated for a material that does not obey Hooke's law throughout?

The total area is found by summing the areas of the separate sections under the graph.

For a material within its limit of proportionality, work done is also equal to the .......... stored in the material.

For a material within its limit of proportionality, work done is also equal to the elastic potential energy stored in the material.

A LevelPhysicsCambridge (CIE)Flashcards6. Deformation of SolidsElastic & Plastic Behaviour

Elastic & Plastic Behaviour (Cambridge (CIE) A Level Physics): Flashcards

Exam code: 9702

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Define elastic deformation.

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Cards in this collection (13)

Define elastic deformation.
When the load is removed, the object returns to its original length.
Define plastic deformation.
When the load is removed, the object does not return to its original length.
Define the elastic limit.
The point beyond which an object does not return to its original length when the load is removed.
What is the difference between the elastic limit and the limit of proportionality?
- The limit of proportionality is where the material stops obeying Hooke's law
- The elastic limit is the furthest point a material can be stretched and still return to its original shape
- The elastic limit occurs at a slightly higher extension than the limit of proportionality
How can brittle and ductile materials be distinguished on a stress-strain graph?
- A brittle material shows a straight line through the origin with no or negligible curve
- A ductile material shows a straight line through the origin, then curves towards the x-axis
.......... materials, such as rubber and copper, have a large plastic region and stretch into a new shape before breaking.
Ductile materials, such as rubber and copper, have a large plastic region and stretch into a new shape before breaking.
True or False?
A brittle material undergoes significant plastic deformation before it breaks.
False.
Brittle materials break with little elastic and insignificant plastic deformation.
Define elastic potential energy.
The energy stored within a material (e.g. a spring) when it is stretched or compressed.
How is the work done in stretching a material found from a force-extension graph?
Work done is equal to the area under the force-extension graph.
How is the area under a force-extension graph calculated for a material that does not obey Hooke's law throughout?
The total area is found by summing the areas of the separate sections under the graph.
What equation gives elastic potential energy in terms of the spring constant, k?
$E P E = \frac{1}{2} k x^{2}$
For a material within its limit of proportionality, work done is also equal to the .......... stored in the material.
For a material within its limit of proportionality, work done is also equal to the elastic potential energy stored in the material.
True or False?
The equation $E P E = \frac{1}{2} k x^{2}$ applies even after a material has passed its limit of proportionality.
False.
This equation only applies while the force-extension graph is a straight line, i.e. while the material obeys Hooke's law within its limit of proportionality.

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