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physics required practicals paper 2
stretching a spring
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To investigate the relationship between
force
and
extension
for a
spring
, follow these steps:
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Equipment needed:
clamp stand
,
two bosses
,
two clamps
,
meter rule
,
spring
,
wooden splint
attached to the
bottom
of the
spoon
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Ensure the
meter rule
is
vertical
for
accurate readings
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Read the
unstretched length
of the spring (length with
no force
attached)
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Add
1 Newton weight
to the
spring
and read the
new position
of the
pointer
on the
meter rule
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Continue adding one
Newton weight
to the
spring
and reading the
position
of the
pointer
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Calculate the
extension
produced by
subtracting
the
length
of the
unstretched spring
from
each reading
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Plot the
extension
against the
weight
to create a
graph
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The graph should be a
straight line
going through the origin, indicating a
linear relationship
between
force
and
extension
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If the graph is
nonlinear
, it indicates a
nonlinear
relationship between
force
and
extension
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If the spring is
elastic
, the extension returns to
zero
when the
weight
is
removed
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If the spring is
over-stretched
, it shows
inelastic deformation
on the graph
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The
force
required to extend a spring can be calculated using the equation:
force
=
spring constant
x
extension
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The spring constant is found by
dividing
the
force
by the
extension
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The spring
constant
remains the same for any part of the graph as long as the
limit
of
proportionality
is not
exceeded
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