Hooke's Law & Elasticity - smart phone physics

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  • Created by: Mal
  • Created on: 19-03-14 11:58
Preview of Hooke's Law & Elasticity - smart phone physics

First 45 words of the document:

Hooke's Law
The extension of an object
is directly proportional to
the applied force up to the
limit of proportionality
k is the Spring Constant
for that object
(units: Nm-1)

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Page 2

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Hooke's Law
F e
Gradient = k
Area = elastic
strain energy
d x
p = limit of proportionality
e = elastic limit dotted
line = unloading d =
permanent extension…read more

Page 3

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Elastic deformation
The term "Elastic" in the
context of materials
means "Elastic behaviour"
i.e. up to the Elastic Limit
a material will return to its
original dimensions when
the deforming force is
So metals can behave
elastically over small
extensions.…read more

Page 4

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Plastic deformation
A material which does not
return to its original
dimensions when unloaded
has deformed plastically.
Metals also exhibit plastic
behaviour for extensions
beyond their Elastic
Limit. A useful property
for making wires.…read more

Page 5

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Plastic deformation
As a direct consequence of
plastic deformation, some
materials (usually metals)
are described as Ductile.
This means that they can
be drawn and stretched
into bars and wires by
tensile forces.…read more

Page 6

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Materials which do NOT
deform plastically before
breaking are described as
Brittle.…read more

Page 7

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Ductile / Maleable
Materials which deform
plastically (and can be
stretched into wires)
before breaking are
described as Ductile.
Materials which can be
pressed or hammered into
different shapes are
Malleable.…read more

Page 8

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Define the following:
Hooke's Law
Limit of Proportionality
Elastic Limit
Brittle…read more

Page 9

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If you were asked to
conduct a Hooke's Law
experiment, what
measurements would you
record AND repeat?
What graph would you plot
and how would the
gradient of this graph
relate to Hooke's Law (be
careful!)…read more

Page 10

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Tensile Stress
The tensile force (tension)
per unit cross-sectional
area.…read more


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