Investigating Energy Stored in a Spring
What is the spring constant?
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Planning
Aim - to gain an average compression rate of the spring in the trolley
in order to find the spring constant.
Apparatus
Clamp stand
2 clamps
2 bosses,
24 0.98N weights
2 weight holders
3 labels
Pencil
Sprit level
Trolley
Ruler (measures to nearest 5 x 10-4m)
Diagram
Plan - I am going to investigate the spring constant of the spring in
the trolley to enable me to calculate the energy stored in the spring
in the major investigation. To calculate the spring constant, I need
to plot my results onto a graph and draw a line of best fit. The
spring constant is equal to the gradient of this straight line. To
obtain my results, the above apparatus will be collected and set up as
shown above. The spirit level will be used to check that the trolley
is perpendicular to the ground. The trolley needs to be perpendicular
to the ground for 2 reasons. 1). So that all of the weight of the
weights act on the spring and not a component, 2). So that there is no
friction between the plunger and it's housing. The variable that is
being changed is the force applied to the spring; 0.98N will be added
in each of the 12 increments. After each weight has been added to the
spring, a pencil mark will be made on the label. When the 12th weight
has been added and the pencil mark made, the weights will be removed
and placed in the order in which they were added. The label will now
be removed and the compression measured and recorded to the nearest
half millimetre. A new one will be put on and the process repeated
twice so three sets of results are obtained. To try and reduce the
error in the measurements, 3 sets of readings are taken, and the
average taken.
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