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Summary Chapter 5: Materials
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Chapter 5: Materials. Physics A(S)-level, AQA. It includes: properties of a material, stress and strain, the Young Modulus and stress-strain and force-extension graphs.
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MATERIALS:
mass
density
P
-
volume
=M
density does not
vary
with size or shape
.
sink whether it floats
density determines or
7
ave r a g e
.
HOOKE law
:
's
1 a Force F springs obey Hooke law
's
=KAL
s
stiffness a pair of opposite forces the extension is propartional
,
to the force applied
.
oK
spring constant
. law applies for compressive or tensile forces
Hooke's
Hooke
law also applies to other materials ( to point
's
a
uB
)
Hooke law stops force is
working when the
great enough
.
's
ELASTIC LIMIT L permemanthy stretcheds STRETCH
Ø
L j
Elastic plastic
:
:
deformation - stretcned
permanently
returns to its shape - do not return
Straighrliner
og
-
atoms
size to the
og position
t
atoms - pulled
apart - stretched PAST their
-
tension:
-
elastic limit -
not reached elastic limit
.
sconserve
Energy
Ewomer stretcning
]
- s
work done
stretching
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