Hooke's Law Investigation
Introduction -
Hooke's Law is when forces are applied to a solid object and it can
result in extension or compression. Hooke's Law is able to predict how
a spring (or other stretchable object) would behave when force is
applied to it. I am trying to find out what factors effect the
stretching of a spring.
The variables are:
Ÿ Downward force applied to spring.
Ÿ Spring material.
Ÿ Length of spring.
Ÿ No. of coils in spring.
Ÿ Diameter of spring material.
Ÿ Cross sectional area of spring.
I have chosen to look at the effect of the weight applied, as it is a
continuous variation.
Predictions -
I predict that the greater the weight applied to the spring, the
further the spring will stretch. This is because extension is
proportional to load and so if load increases so does extension and so
stretching distance.
Extension = Original length - New length
To see if my prediction is correct I will experiment, and obtain
results using Hooke's Law. Hooke's Law states that in an elastic
material strain is proportional to stress.
The point at which a material ceases to obey Hooke's Law is known as
its elastic limit. This means that extension is proportional to the
downward force acting on the spring.
Hooke's Law is: F= ke
F = Force in Newtons
k = Spring constant
e = Extension in Meters
Equipment Needed -
Ÿ Clamp stand and 2 boss clamps
Ÿ Meter ruler
Ÿ Spring
Ÿ 10 x 1N weights
Method -
My method of experimentation will be to use a clamp stand and boss
clamp to suspend a spring from. A second boss clamp wi...
... middle of paper ...
...emed to be very accurate. They all followed a pattern
until they reached the elastic point. After they had hit the elastic
point the results became harder to record because they were so varied.
Also some of the measurements could have been slightly inaccurate
because I was using a mater ruler. To make sure that all my results
were accurate I would have to have more time and be able to repeat
them again. Further investigations could use Young´s Modulus This was
created by Thomas Young and gives a number representing (in pounds per
square inch or dynes per square centimetre) the ratio of stress to
strain for a wire or bar of a given substance. According to Hooke´s
law the strain is proportional to stress, and therefore the ratio of
the two is a constant that is commonly used to indicate the elasticity
of the substance.
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