A-LEVEL PHYSICS: 4.7.4: Elastic Strain Energy (SaveMyExams)

Question 1

___ has to be ___ to Stretch a Material.

Answer 1

Work, done

Question 2

Before a Material reaches its Elastic Limit, all the Work Done is stored as…

Answer 2

Elastic Strain Energy

Question 3

What does the Area under a Force-Extension Graph Represent?

Answer 3

Work Done (= Elastic Strain Energy)

Question 4

As greater Force is applied on a Material, the ___ on it Increases.

Answer 4

Stress.

Question 5

Force applied to a Material and Stress are…

Answer 5

Directly Proportional

Question 6

What is ‘Breaking Stress’?

Answer 6

The Breaking Stress is the Maximum Stress a Material can stand before it Fractures.

Question 7

What is ‘Ultimate Tensile Stress’?

Answer 7

UTS is the Maximum Stress that the Material can withstand.

Question 7

A Material with High Breaking Stress is… What does this mean?

Answer 7

Ductile.
This means it can extend more before breaking because of Plastic Deformation.

Question 8

The UTS & Breaking Stress of a Material can depend on the Condition of the Material, eg…

Answer 8

Temperature.

Question 9

When a vertical Spring is Extended & Contracted, Energy will Transfer between certain Stores: (3)

Answer 9

-Elastic Potential Energy
-Kinetic Energy
-Gravitation Potential Energy

Question 10

Explain the Energy Stored in a Vertical Spring as it Extends Downwards at each Position.
-Position A: Start (at the top)
-Position B: Middle
-Position C: Fully Extended

Answer 10

-At Position A:
-Some EPE (slightly Compressed)
-Kinetic Energy = 0
-GPE is at its Maximum (Mass is at its Highest Point)

-At Position B:
-More EPE (slightly Stretched)
-Kinetic Energy is at its Maximum (passes through Equilibrium position at Maximum Speed)
-Some GPE (because Mass is still above ground)

-At Position C:
-EPE is at its Maximum (fully Stretched)
-Kinetic Energy = 0 (Stationary)
-GPE is at a Minimum (Mass is at its Lowest point)