WEEK 7 - REVISION QUIZ

Categorise these concepts to understand stress and strain when force is applied on a rod.

Groups:

(a) Tension

,

(b) Compression

• The length of rod will decrease.

• The cross-sectional of rod will decrease.

• The cross -sectional area will increase.

• The length of rod will increase.

Stress, X, is derived as force per unit area. When X is larger than 0, specimen is in​ (a)   .When X is smaller than 0, specimen is in ​ (b)   .

• tension
• compression
• stress
• strain
• tensile
• ductile
• hard
• elastic

What is deformation, ε?

• Total length per unit of the original length.

• Change of length per unit of the original length.

• Final length per unit of the original length.

• Surface area per unit of the original length.

Stress per strength is known as ​ (a)   . If ​ (b)   is large, the material is ​ (c)   . If the ​ (d)   is small, the material is ​ (e)   .

• Young Modulus
• strong
• weak
• elongation
• ductile
• plastic
• Sigma
• Epselon

Organize these Mechanical Properties

Groups:

(a) Strength

,

(b) Hardness

,

(c) Ductility

,

(d) Malleability

• Able to undergo appreciable plastic deformation before rupture.

• Able to deform into thin sheets by rolling/hammering without fracture.

• Ability of material to withstand or support external force of load without rupture.

• Able to resist deformation such as abrasion, indentation etc by harder bodies.