# For this investigation I have been asked to find out how different masses on a spring effect the extension when the springs are in parallel, series and on a single spring.

Investigation into Spring Constants

Physics

Planning

Aim

For this investigation I have been asked to find out how different masses on a spring effect the extension when the springs are in parallel, series and on a single spring.

Key factors

Independent variables:

• Extension of spring

Dependent variable

• Mass on spring(s)

Controlled variable

• Springs

The range of readings that I am going to take will be from 0kg to 0.50kg this is because it will give me a good set of data to work with.

I will increase the mass by half a kilogram each time.

To make sure I get good accurate fair results I will repeat the process at least 3 times.

When I do repeat the process I will make sure that I leave all the equipment as it is and not replace bits or add or remove components.

To make sure that I don’t have to replace any components, I will before I start the test make sure that all my equipment is working correctly and properly calibrated to the range of readings that I will take in the test.

Prediction

I predict that the extension of a spring will be proportional to its load during its elastic region and that when the load of the spring is doubled so will the extension of the spring; this can then be used to find the spring constant. If two springs are placed in series, I believe that the extension of the springs will be double the extension of a single spring with the same load (therefore will have half the spring constant of a single spring); and similarly if two springs are placed in parallel then the load will be spread evenly across the two springs so it will require twice the load to produce the same extension of only one spring (and have twice the spring constant of a single spring).

## Safety

Since masses are to be used, the experiment will be conducted over a table so that if the spring were to break the masses would not fall to the floor and injure somebody.

Preliminary work

For my preliminary work I carried out my planned procedure to see if there had to be any alterations made to the method. I carried out the test and I decided to use a sprit level to make sure that the ruler is level and so I could take a reading at exactly 90°.

## These were the results that I got from the preliminary test using just the two springs on their own.

I have decided to extend ...