Materials

Question 1

Stress (P)

Answer 1

Force per unit cross-sectional area.

Question 2

Strain (none)

Answer 2

Extension per unit length.

Question 3

Young Modulus (P)

Answer 3

The ratio between stress and strain for a specific material.

Question 4

Ultimate Tensile Strength (P) (also Breaking Stress)

Answer 4

The maximum tensile stress that can be applied to a material before it breaks.

Question 5

Elastic deformation

Answer 5

The change in shape of a material under stress that is recoverable when the stress is removed.

Question 6

Plastic deformation

Answer 6

The change is shape of a material under stress that is not recoverable when the stress is removed.

Question 7

Ductile

Answer 7

Materials that show plastic deformation.

Question 8

Brittle

Answer 8

Materials that is unable to store much elastic potential energy and snap easily.

Question 9

Hard

Answer 9

Materials that resist plastic deformation.

Question 10

Malleable

Answer 10

Materials that show large plastic deformation areas.

Question 11

Stiff

Answer 11

Materials ability to resist tensile force (stiffer has greater Young’s Modulus).

Question 12

Tough

Answer 12

Materials that are able to withstand impact forces without breaking.

Question 13

Compressive Stress

Answer 13

The compression force per unit area.

Question 14

Compressive Strain

Answer 14

The compression extension per original length.

Question 15

Tensile Stress

Answer 15

The tension force per unit area.

Question 16

Tensile Strain

Answer 16

Extension per unit length.

Question 17

Compressive Strength

Answer 17

The maximum compressive stress applied before it breaks.

Question 18

Limit of proportionality

Answer 18

Where Hooke’s Law stops and plastic deformation starts.

Question 19

Elastic limit

Answer 19

The point where elastic stops and plastic starts.

Question 20

Yield Point

Answer 20

Where small increase in stress causes large increase in strain.