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Materials under stress — OCR GCSE Physics B J259
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Physics
OCR GCSE Physics B
Matter – models and explanations
Materials under stress
Materials under stress
OCR GCSE Physics B · J259
Materials under stress
What you need to know
Explain the need for multiple forces to stretch/bend/compress objects.
Use the particle model to explain elastic vs plastic deformation.
Describe the force-extension relationship and experimental measurement.
Distinguish between linear and non-linear force-extension systems.
Apply the spring constant equation for linear systems:
f
o
r
c
e
(
N
)
=
s
p
r
i
n
g
c
o
n
s
t
a
n
t
(
N
/
m
)
×
e
x
t
e
n
s
i
o
n
(
m
)
Revision notes
1
Deformation and the Particle Model
3 key terms
2
Hooke's Law and Force-Extension Relationships
5 key terms
3
Work Done and Elastic Potential Energy
4 key terms
Practise with past papers
Key terms & definitions
Previous topic: Particle model and heating
Particle model and heating
Next topic: Pressure in fluids
Pressure in fluids
force\ (N) = spring\ constant\ (N/m) \times extension\ (m)
f
or
ce
(
N
)
=
s
p
r
in
g
co
n
s
t
an
t
(
N
/
m
)
×
e
x
t
e
n
s
i
o
n
(
m
)
Calculate work done in stretching by area under force-extension graph.
Apply the stored energy equation:
e
n
e
r
g
y
s
t
o
r
e
d
(
J
)
=
1
2
×
s
p
r
i
n
g
c
o
n
s
t
a
n
t
×
e
x
t
e
n
s
i
o
n
2
energy\ stored\ (J) = \frac{1}{2} \times spring\ constant\ \times extension^2
e
n
er
g
y
s
t
or
e
d
(
J
)
=
2
1
×
s
p
r
in
g
co
n
s
t
an
t
×
e
x
t
e
n
s
i
o
n
2
