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Loading and Unloading

Loading and Unloading a Metal WireThe loading and unloading line is the same provided the elastic limit is not exceeded.Beyond the elastic limit, the unloading line is parallel to the loading line and there is permanent extension.

Loading and Unloading a Rubber Band

The change in length during unloading is greater than during loading for a given tension.There is a low limit of proportionality.
Loading and Unloading a Polythene Strip

The extension during unloading is greater than the extension during loading and the material does not return to its original length.

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Specification: AQA Physics (7407), AS-level, 3.4.2.1 Bulk properties of solids. Topic: Materials.

Key terms in this lesson

Thermistor: A component whose resistance decreases markedly as its temperature increases, because more charge carriers become available.
Light dependent resistor: A component whose resistance decreases as the intensity of light falling on it increases.
Diode: A semiconductor component that allows current to flow easily in one direction, forward bias, but has a very high resistance in the other, reverse bias.
Threshold voltage: The minimum forward potential difference across a diode, about 0.6V for silicon, needed before it conducts appreciably.

More in Materials

All 18 lessons in Materials · All AQA AS-level Physics topics