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Questions and Answers
What is the institution mentioned in the text?
What is the institution mentioned in the text?
- Cairo University
- Alexandria University
- Helwan University (correct)
- Ain Shams University
What is the faculty mentioned in the text?
What is the faculty mentioned in the text?
- Faculty of Engineering (correct)
- Faculty of Medicine
- Faculty of Arts
- Faculty of Science
What title or position is mentioned in the text?
What title or position is mentioned in the text?
- Dr. (correct)
- Engineer
- Doctor
- Professor
What is the category of the topic mentioned in the text?
What is the category of the topic mentioned in the text?
What is the name of the university mentioned in the text?
What is the name of the university mentioned in the text?
What is brittleness in the context of material properties?
What is brittleness in the context of material properties?
What happens to a brittle material when it is stressed?
What happens to a brittle material when it is stressed?
Which of the following materials is more likely to exhibit brittleness?
Which of the following materials is more likely to exhibit brittleness?
What is a common consequence of a material's brittleness?
What is a common consequence of a material's brittleness?
Why is it important to consider brittleness in material selection?
Why is it important to consider brittleness in material selection?
What is the range of density for the material?
What is the range of density for the material?
What is the ability of the material to return to its original dimensions when the external applied load is removed known as?
What is the ability of the material to return to its original dimensions when the external applied load is removed known as?
What is the symbol for the change in temperature?
What is the symbol for the change in temperature?
What is the mechanical property of materials being referred to in the passage?
What is the mechanical property of materials being referred to in the passage?
What happens to the material when the external applied load is removed?
What happens to the material when the external applied load is removed?
What is the primary characteristic of plasticity?
What is the primary characteristic of plasticity?
What happens to a material exhibiting plasticity when it is subjected to stress?
What happens to a material exhibiting plasticity when it is subjected to stress?
What is the result of a material undergoing plastic deformation?
What is the result of a material undergoing plastic deformation?
What is the opposite of plasticity in terms of material behavior?
What is the opposite of plasticity in terms of material behavior?
What is a possible consequence of a material having high plasticity?
What is a possible consequence of a material having high plasticity?
What is the primary characteristic of hardness in a material?
What is the primary characteristic of hardness in a material?
What is the main difference between hardness and strength in a material?
What is the main difference between hardness and strength in a material?
What is the unit of measurement for strength in a material?
What is the unit of measurement for strength in a material?
What is an example of a force that a material's strength might resist?
What is an example of a force that a material's strength might resist?
What property of a material is related to its ability to resist cutting?
What property of a material is related to its ability to resist cutting?
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Study Notes
Mechanical Properties of Materials
- Density of materials ranges from 2200 to 2500 kg/cm².
Elasticity
- The ability of a material to return to its original dimensions when the external applied load is removed.
- Occurs when the material is subject to external stress and then returns to its original shape once the stress is removed.
Plasticity
- The property that permits materials to undergo permanent change in shape without fracture.
- The material does not return to its original dimensions after the external applied load is removed.
Brittleness
- The property of a material that makes it fracture before much or no deformation is noticeable.
- Materials with high brittleness break or crack easily under stress.
Hardness
- The ability of a material to resist scratching, abrasion, and cutting.
- Hardness is a measure of a material's resistance to wear and tear.
Strength
- The resistance of a material to any applied forces.
- Measured in known stress units, such as pascals or pounds per square inch (psi).
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