Physics P2 - Hooke’s law

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Hooke's law
What is Hooke's law?
The extension of an elastic object is directly proportional to the force applied to it:
F - is the force in newtons, N
k - is the 'spring constant' in newtons per metre, N/m
e - is the extension in metres,
What does this mean?
This means the displacement of a spring is in ratio (directly proportional) to the weight of the material
added. Hooke's law is only an approximation to the real response of
elastic material; it would eventually fail when the forces exerted exceed
some limit, the elastic limit, where after the elastic material breaks or
deforms so much it cannot be put into its original shape. The increased
length of an elastic object like a spring is called the extension. Hooke's
law can be explained through stresses and strains. Stress is the force
applied to the material and strain is the resultant deformation or
extension produced by stress. For relatively small masses the strain is
directly proportional to the stress.
Method of Hooke's Law experiment
Attach the semi-small spring to the stand
which is firmly connected to the end of a table and
measure the spring's constant length from the
beginning of the coil to the end of the coil. Note
down measurements in the table. Later attach the
assorted weights onto the end of the spring and
record the results in the table. Repeat test for all
the different weights remembering to measure in the same fashion as when you
measured the spring's constant length. If weights are not available you may use a
newton meter to apply different force values and record them in
the table similarly to the weights.
Risk assessment
Springs are unreliable and incorrect use of them may cause
injuries especially if the might have flung into somebody's eye.
Tuck chairs in and place bags under desks to avoid any tripping
hazard as this could injure someone who may be carrying equipment to the pod.
The weights may be heavy so be careful with them as incorrect use may cause injury because they might hit
someone on the head
Is a spring was to break, the flying debris might hit someone in the eye therefore eye protection must be


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