# AS Physics Unit 2: Materials Notes

These are not my notes i just put them in document form, they're from this website ->http://physicsnet.co.uk/

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- Created by: Mariam
- Created on: 26-04-14 13:45

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Hooke's Law

Density () is measured in kg m-3. It can be calculated using the equation below;

= density in kg m-3

m = mass in kg

V = volume in m3

Hooke's Law

The extension of a spring or wire is directly proportional to the force applied provided the limit of proportionality is not exceeded.

When a graph of force against extension is plotted for a material which obeys Hooke's law it looks like the graph below.

The gradient of this graph is the spring constant (k) which is measured in Nm-1.

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