Hysteresis

Aim: To investigate the pattern in the amount by which a hanging piece of elastic stretches when a load force is applied and the amount by which the stretch is reduced when the load is removed.

Aim (in simpler terms): To determine the relationship between the force on a rubber band and its stretch, both during extension and retraction.

Hypothesis: Not required.

Method

1) Hang a piece of elastic on a clamp stand. Ensure the elastic is new.

2) Clamp a ruler using the clamp stand. Ensuring the markings on the ruler is as close to the elastic as possible.

- Draw a diagram

3) Measure the length of the elastic and record the data.

4) Hang masses on the elastic until it reaches it point of irreversible distortion. Take note of this weight; do not hang more than this weight in the experiment.

5) Add a weight of 100N (change appropriately). Wait for a few seconds for the system to “stabilise”. Measure the length of the elastic and record the data. Special care must be taken to ensure that when the mass is added the elastic should not retract.

6) Add more weights, till the total weight is close to its point of irreversible distortion