Inference: The force acting on a
spring influences its extension.
Hypothesis: The bigger the force
acting on the spring,
the bigger is the
extension of the spring.
Aim: To investigate the
relationship between the force acting on a spring and the extension of the
spring.
Variables: Manipulated
variable: Force acting on spring.
Responding variable:
Extension of spring
Fixed variables : Thickness of spring
Apparatus: Spring, slotted weights,
retort stand with 2 clamps, meter rule
Diagram: (Draw a labeled diagram)
Procedure:
1.
The apparatus is set up as shown in the diagram above.
2.
A slotted weight of 20 g is hanged onto the spring
to provide the pulling force (F = 0.2 N).
3.
The extension of the spring, x, is measured using
the meter rule placed at the side.
4.
The experiment is repeated 4 more times by adding a slotted
weight 20 g each time until the total mass
is 100 g.
5.
The extension of the spring is also measured each time.
6.
A graph of extension x (cm) against mass m (gramme) is then plotted.
Results:
Mass, m (gramme)

Extension, x (cm)

5 sets of values

5 sets of values

Analysis:
The
graph of extension against mass shows a straight line passing through
the
point of origin (0,0).
Conclusion:
(1)
The extension of the spring is directly proportional to the mass of slotted
weights attached to the spring.
(2)
It also means that the extension of the spring is directly proportional to the
force acting on the spring.
(3)
The hypothesis is accepted.
Precaution:
When
adding slotted weights to the spring, do not exceed the elastic
limit
of the spring.
Below are samples of xm graph. Students are to follow their own data. Do not copy other group's data.
The best straight line is supposed to pass through as many points as possible and also the point of origin (0,0). All the graphs show good results except Group: Ng Ray Son.
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