Phys 4.1

Question 1

Elastic Region

Answer 1

The region where any deformation can be restored naturally by the material when the tensile or compressive force is removed.

Question 2

Proportional Elastic Region

Answer 2

The region within the elastic region where the force is proportional to the extension. Follows Hooke’s Law.

Question 3

Non-linear Elastic Region

Answer 3

The region within the elastic region where the force is not proportional to the extension. Does not follow Hooke’s Law.

Question 4

Proportional Limit

Answer 4

The upper boundary of the proportional region.

Question 5

Elastic Limit

Answer 5

The boundary between the elastic and plastic regions. Further loads will cause permanent deformation.

Question 6

Plastic Region

Answer 6

The region where the force induces permanent deformations.

Question 7

Fracture Point

Answer 7

The point where, if further force is applied, the solid will rupture.

Question 8

Advantages of Stress/Strain

Answer 8

• Indpendent of shape and size of the material.
• Only depends on the type of material.

Question 9

Ultimate Tensile Stress

Answer 9

The maximum stress a material can withstand before it ruptures.

Question 10

Young’s Modulus

Answer 10

The ratio of stress to strain in a material.