OCR material definitions

Choose the property being described

the ratio stress/strain when a material is stretched elastically

• Brittleness

• Hardness

• Toughness

• Stiffness

• Strength

Choose the property being described

the tendency to break by crack propagation

• Toughness

• Brittleness

• Hardness

• Strength

• Stiffness

Choose the property being described

The stress required to break a material

• Elasticity

• Hardness

• Toughness

• Stiffness

• Strength

Choose the property being described

A measure of the difficulty of scratching or denting the material

• Elasticity

• Hardness

• Toughness

• Stiffness

• Strength

Choose the property being described

a measure of the stress a material can take before yielding

• Brittleness

• Plasticity

• Stiffness

• Strength

Choose the property being described

a measure of a material’s resistance to stretching or bending

• Brittleness

• Plasticity

• Stiffness

• Strength

Choose the property being described

the tendency of a material to break by crack propagation

• Brittleness

• Plasticity

• Stiffness

• Strength

A wine glass can support large compressive stress, but may shatter, by crack propagation, if dropped a small distance onto a hard surface.

Choose the two properties of glass from the list that best fit the statement about the wine glass.

• brittle

• elastic

• plastic

• strong

• tough

Which statement about mechanical properties of materials is not correct?

• Cracks are a common way in which a brittle material can fail mechanically.

• A material with a high Young modulus will be very stiff.

• The tensile strength of a stiff material can be relatively small.

• If a material is tough it will also usually be brittle.

Which of these terms relates to the force per unit area at which a material begins to deform plastically?

• Breaking Stress

• Breaking Strain

• Yield Stress

• Yield Strain