Materials

Question 1

Stress

Answer 1

Force per unit cross sectional area

Question 2

Strain

Answer 2

Extension per unit length

Question 3

Young modulus

Answer 3

Ratio between stress and strain

Question 4

Ultimate tensile stress

Answer 4

Maximum tensile stress that can be applied to a material before it breaks

Question 5

Elastic deformation

Answer 5

Change in shape of a material under stress that is recoverable when stress is removed

Question 6

Plastic deformation

Answer 6

Change in shape of a material under stress that is not recoverable when stress is removed

Question 7

Ductile

Answer 7

Material that shows plastic deformation

Question 8

Brittle

Answer 8

Materials that can’t store much elastic potential energy and snaps easily

Question 9

Hard

Answer 9

Materials that’s resist plastic deformation

Question 10

Stiff

Answer 10

Materials that resist tensile force

Question 11

Malleable

Answer 11

Materials that show large plastic deformation

Question 12

Tough

Answer 12

Materials that are able to withstand impact forces without breaking

Question 13

Compressive stress

Answer 13

Compression force per unit area

Question 14

Compressive strain

Answer 14

Compression extension per original length

Question 15

Tensile strain

Answer 15

Extension per unit length

Question 16

Tensile stress

Answer 16

Tensile force per unit area

Question 17

Limit of proportionality

Answer 17

A point where elastic stops and plastic starts

Question 18

Yield point

Answer 18

Small increase in stress causes large increase in strain

Question 19

Laminar flow

Answer 19

Occurs at lower speeds with uniform flow over time

Question 20

Terminal velocity

Answer 20

A constant velocity where there is no resultant force

Question 21

Turbulent flow

Answer 21

Velocity of flow changes over time