# In this experiment I aim to find a value for the Young's Modulus of a piece of cassette tape. Young's Modulus is a way of expressing how much a certain material is stretched or compressed.

Physics A-S level Coursework                Matthew Lloyd

## Young’s Modulus Investigation

A.

In this experiment I aim to find a value for the Young’s Modulus of a piece of cassette tape. Young’s Modulus is a way of expressing how much a certain material is stretched or compressed. For the same material the Young’s Modulus is always the same, this can be explained by looking at the way in which we calculate it.

## Young’s Modulus = Stress  ÷ Strain

The amount of stress exerted on a material can be calculated by: -

## Force ÷ Area

Strain is calculated by: -

## Extension ÷ Original length

To find the Young’s Modulus of the cassette tape, I will attach certain weights to the end of the tape and measure the extension caused by each weight. I will also have to determine the cross sectional area and the length of the tape before I attach any weights to the cassette tape.

Here is a diagram to illustrate what my experiment will look like: -

## The apparatus required

1. A clamp Stand
2. Cassette tape (71cm)
3. Set of weights (with intervals of 50g)
4. Weight holder (10g) to attach weights to cassette tape
5. A 200cm rule (made from two metre rules)
6. A Micrometer

## Method

I will set up the experiment as shown in the diagram in order to start my investigation. But first I need to measure the length and cross sectional area of the tape accurately and attach it to the clamp stand. I can then start adding weights:-

1. Measure width and depth of the cassette tape in order to find the cross-sectional area.
2. Add weight holder to tape and measure the original length.
3. Add a 50g weight and then measure the extension .
4. Measure the reading from part 3 twice more.
5. Repeat step three and ...