M2.2 CAT A Stress, strain and elasticity

What does strain describe in the context of materials science?

• The weight of a material

• The deformation of a material due to stress

• The temperature change in a material

• The color change in a material

What is strain in a material?

• A unit of force

• A type of material

• Extension/unit length

  A ratio that has no unit

• A measurement of volume

What does the symbol ε (Epsilon) represent in the context of strain?

• Elasticity

• Energy

• Strain

• Stress

What does ΔL represent in the strain formula?

• Change in length

• Original length of material

• Force applied on the material

• Area of the cross-section of the material

What does L_o represent in the strain formula?

• Change in length

• Original length of material

• Force applied on the material

• Area of the cross-section of the material

What is elasticity in the context of materials?

• The ability of a material to absorb energy

• The ability of a material to return to its original shape once external forces have been removed

• The ability of a material to permanently deform when stretched

• The ability of a material to conduct electricity

How do internal atomic binding forces behave in an elastic material?

• They break easily when external forces are applied

• They remain unchanged regardless of external forces

• They are stretched but not broken, acting like little springs

• They convert into liquid form when external forces are applied

What limits a material's elasticity?

• The temperature at which it melts

• The amount of light it can reflect

• The amount of stress it can bear before permanent deformation or strain occurs

• The amount of weight it can hold without breaking

What is plasticity in the context of material properties?

• The ability of a material to return to its original shape after the stress is removed

• The ability of a material to change its shape permanently when subjected to stress

• The ability of a material to withstand stress without any deformation

• The ability of a material to break when subjected to stress

What happens to a material with plasticity after the force applied to it has been removed?

• The material returns to its original shape

• The material remains deformed

• The material becomes stronger

• The material disintegrates