A-LEVEL PHYSICS: 4.7.3: Stress & Strain (SaveMyExams)

Question 1

Opposite Forces can ___ an object.

Answer 1

Deform.

Question 2

If Opposite Forces ___ an object, they are Tensile Forces.

Answer 2

Stretch.

Question 3

If Opposite Forces Stretch an object, the are…

Answer 3

Tensile Forces.

Question 4

What are ‘Tensile Forces’?

Answer 4

Tensile Forces are Opposite Forces that Deform an Object by Stretching it.

Question 5

What is ‘(Tensile) Stress’?

Answer 5

Stress is the Forces exerted per unit Cross-Sectional Area of a Material.

Question 6

Stress = …

Answer 6

Force/Area

(Cross-Sectional Area)

Question 7

What is ‘Ultimate Tensile Stress’?

Answer 7

Ultimate Tensile Stress is the maximum Force per unit Cross-Sectional Area a wire is able to support before breaking.

Question 8

Units of Stress:

Answer 8

Pascals, Pa

Question 9

What is ‘(Tensile) Strain’?

Answer 9

Strain is the Extension per unit Length.

Question 10

Strain = …

Answer 10

ΔL / L

Question 11

Units of Strain:

Answer 11

Dimensionless (no Units)

Question 12

Stress-Strain Curves describe the Properties of Materials such as whether they are ___, ___, and up to what ___ & ___ they obey Hooke’s Law.

Answer 12

Brittle, Ductile, Stress, Strain

Question 13

Each Material will have a unique…

Answer 13

Stress-Strain Graph.

Question 14

Important points on Stress-Strain Graph: (5)

Answer 14

-Limit of Proportionality
-Limit of Elasticity
-Yield Stress
-Breaking Point
-Ultimate Tensile Strength

Question 15

What is the ‘Yield Stress’ on a Stress-Strain Graph?

Answer 15

Yield Stress is the Force per unit Area at which the Material extends plastically (no Increase in Strain).

Question 16

What is the ‘Breaking Point’ on a Stress-Strain Graph?

Answer 16

The maximum Stress a Material can stand before it Fractures.