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Summary OCR A level Physics A 3.4 Materials £5.49   Add to cart
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Summary OCR A level Physics A 3.4 Materials
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Summary notes for topic 3.4 Materials covering springs, elastic potential energy, force extension graphs, tensile stress and strain and Young modulus. Notes contain definitions, highlighted key terms, explanations, diagrams and break downs of equations

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  • June 28, 2022
  • 6
  • 2021/2022
  • Summary

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3.4 Materials

, and Hooke 's Law
Springs

change the shape of an object you
To
,
need a
pair
of equal and opposite forces .




> > <

tensile forces compressive forces
Hooke's law : the extension of a
spring
is
directly
proportional to the force applied , up until
the elastic limit .




Force extension
graph
-

:



F
from the origin to A extension ,

A. is
directly proportional to

force applied and the
spring
only deforms elastically (will
return to
original shape /
Point A is the elastic limit From
.




here onwards,
deformation
is
plastic
.




0 x
;

f- Roc F, N
-




force ,
in newtons ,


per metre Nm
"
K, force constant ,
in newtons ,


X, extension ,
in metres , m .




The larger the
force constant ,
the stiffer the
spring .




x can also represent the compression of the spring .

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