Material Science: Elasticity and States of Matter
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Questions and Answers

What characterizes a solid state of matter?

  • Definite volume and shape (correct)
  • No definite volume or shape
  • Definite volume but no definite shape
  • Changes shape over time
  • Which statement best describes elasticity?

  • A substance cannot regain its original shape after distortion
  • A substance regains its original shape and size after distortion (correct)
  • Materials can only be elastic in liquid state
  • A material cannot change shape under force
  • What happens when a substance exceeds its elastic limit?

  • It remains unchanged in shape
  • It loses all elasticity and becomes plastic (correct)
  • It turns into a liquid state
  • It regains its shape perfectly
  • What is the yield point in terms of material properties?

    <p>The point where material becomes permanently stretched (D)</p> Signup and view all the answers

    What is meant by the term 'breaking point' in material science?

    <p>The maximum extension before a material breaks (B)</p> Signup and view all the answers

    Under what conditions can a substance exist as a solid, liquid, or gas?

    <p>Depending on temperature and pressure (C)</p> Signup and view all the answers

    What describes an elastic material?

    <p>A material that returns to its original size after the force is removed (B)</p> Signup and view all the answers

    How would you describe a liquid state of matter?

    <p>Definite volume but no definite shape (D)</p> Signup and view all the answers

    What is the elastic constant or stiffness of an elastic material defined as?

    <p>The force required to give a unit extension (D)</p> Signup and view all the answers

    Which of the following correctly describes Hooke's Law?

    <p>Extension is directly proportional to the applied force up to the elastic limit (C)</p> Signup and view all the answers

    What does stress measure in a material?

    <p>The force applied per unit area (C)</p> Signup and view all the answers

    How is strain mathematically defined?

    <p>The ratio of extension to original length (D)</p> Signup and view all the answers

    What occurs at the breaking point of a material?

    <p>The material permanently deforms and cannot recover (B)</p> Signup and view all the answers

    What is the elastic modulus (E.M)?

    <p>The constant that relates stress to strain for a material (B)</p> Signup and view all the answers

    In which region does the material begin to exhibit plastic behavior?

    <p>After the elastic limit is exceeded (D)</p> Signup and view all the answers

    Which term is used to describe the point at which a material can no longer return to its original shape?

    <p>Yield point (D)</p> Signup and view all the answers

    What happens to the volume of an object when the pressure changes?

    <p>The volume will change by an amount related to the bulk modulus. (A)</p> Signup and view all the answers

    What is the SI unit of pressure?

    <p>Pascal (A)</p> Signup and view all the answers

    What kind of stresses can fluids exert on an object submerged in them?

    <p>Compressive stresses only (B)</p> Signup and view all the answers

    Why do snowshoes prevent sinking into soft snow?

    <p>They distribute the weight over a larger area, reducing pressure. (A)</p> Signup and view all the answers

    In a flat slab of concrete supported at the ends, where do cracks typically occur and why?

    <p>Cracks occur at the bottom due to tensile stress. (C)</p> Signup and view all the answers

    What is the relationship between the change in volume and initial volume called?

    <p>Volume strain (D)</p> Signup and view all the answers

    If the volume of an object decreases under pressure, what does this indicate about the bulk modulus?

    <p>The bulk modulus is high, indicating resistance to compression. (B)</p> Signup and view all the answers

    How does the pressure exerted by the waterbed on the floor calculate?

    <p>It is computed by dividing force by the surface area. (D)</p> Signup and view all the answers

    What is the relationship defined by Young's modulus?

    <p>The ratio of tensile stress to tensile strain (D)</p> Signup and view all the answers

    In the context of shear modulus, what does shear stress measure?

    <p>The ratio of tangential force to the area of the face being sheared (C)</p> Signup and view all the answers

    What happens to an object when it is subjected to bulk modulus?

    <p>There is a change in volume but no change in shape (C)</p> Signup and view all the answers

    How is tensile stress defined mathematically?

    <p>$ rac{F}{A}$ where F is force and A is area (A)</p> Signup and view all the answers

    When a rectangular block is sheared, what shape results?

    <p>Parallelogram (C)</p> Signup and view all the answers

    What does the bulk modulus quantify?

    <p>Uniform compression of materials (C)</p> Signup and view all the answers

    What defines shear strain during the shearing process?

    <p>$ rac{d}{h}$ where d is horizontal distance moved and h is height (B)</p> Signup and view all the answers

    Which of the following correctly describes tensile strain?

    <p>The ratio of change in length to the original length (A)</p> Signup and view all the answers

    Flashcards

    Proportionality Limit

    The maximum load where stress is linear with strain.

    Elastic Limit

    The maximum stress that a material can withstand without permanent deformation.

    Yield Point

    The point at which a material begins to deform plastically.

    Breaking Point

    The load at which a material ultimately fails or breaks.

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    Elastic Constant

    The force needed to produce a unit extension in an elastic material.

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    Hooke's Law

    States that extension is proportional to the applied load within the elastic limit.

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    Stress

    A measure of internal force per unit area within materials.

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    Strain

    The measure of deformation representing the displacement between particles in a material.

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    Young’s Modulus

    The ratio of tensile stress to tensile strain in a material.

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    Tensile Stress

    The ratio of external force applied to the cross-sectional area of a material.

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    Tensile Strain

    The ratio of the change in length to the original length of a material.

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    Shear Modulus

    The ratio of shear stress to shear strain in a material.

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    Shear Stress

    The ratio of tangential force to the area of the surface being sheared.

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    Shear Strain

    The ratio of horizontal displacement to height in an object under shear stress.

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    Bulk Modulus

    Measures a substance's response to uniform compression or pressure change.

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    Volume Stress

    The ratio of normal force to the area over which it acts in volume deformation.

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    Volume Strain

    The change in volume of an object relative to its initial volume.

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    Fluid

    A collection of molecules arranged randomly, like liquids and gases.

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    Pressure in Fluids

    The force exerted by a fluid acting perpendicular to a surface.

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    Pascal (Pa)

    The SI unit of pressure, defined as one newton per square meter.

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    Shearing Stress

    A stress that occurs when forces are applied parallel to a surface.

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    Example of Pressure Distribution

    Snowshoes distribute weight to reduce pressure on soft surfaces.

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    Compression vs Tension

    Compression pushes together, tension pulls apart materials.

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    States of Matter

    Matter exists primarily in three states: solid, liquid, and gas.

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    Solid

    A state of matter with a definite volume and shape.

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    Liquid

    A state of matter with a definite volume but no definite shape.

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    Gas

    A state of matter with neither definite volume nor shape.

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    Elasticity

    The ability of a substance to return to its original shape after distortion.

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