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Physics, A Level Ocr Spec a > Materials > Flashcards

Flashcards in Materials Deck (14)
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1
Q

What is hooke’s law?

And what is Hooke’s law equation?

A

The extension is proportional to the force applied provided the limit of proportionality is it exceeded.
F=kx

2
Q

If one spring is stretched by 1 meter when 1 newton of force is applied, how far would two springs in parallel stretch under 1 newton of force?
And what equation can be used for this?

A

Half a metre

(1/k)+(1/k)= 1/K

3
Q

If one spring is stretched by 1 meter when 1 newton of force is applied, how far would two springs attaches end to end stretch under 1 newton of force?

A

2 metres

k+k=K

4
Q

What is the energy conversion of a mass stretching a spring?

A

Gravitational potential to storage potential

5
Q

The area under a force extension graph is what?

A

Equal to the potential energy storage in the object extending

6
Q

What is the symbol for stress and strain?

A

Stress: σ
Strain: ε

7
Q

What is the letter for Young’s modulus?

A

E

8
Q

Something that can withstand high stress but doesn’t strain much before breaking is what?

A

Brittle

Crunchie

9
Q

A material that can undergo large amounts of strain but little stress is what?

A

Polymeric

Wham

10
Q

A material that stress and strains evenly (ish) until it reaches a region of plastic deformation where it strains until it breaks

A

Ductile

11
Q

When stretching a rubber band what does the stress strain graph look like when loading and unloading with masses?

A

When loading the gradient starts larger, gets smaller the gets larger again.
When unloading a similar path is taken in reverse slighting below the loading graph, but ending and starting at the same points

12
Q

What does the area enclosed in a hysteresis loop equal to?

A

The energy transferred per unit volume from elastic potential is heat energy

13
Q

Define ductile

A

A material that has a large plastic region in a stress strain graph

14
Q

Define Brittle

A

Does not show plastic deformation and deforms little under high stress