Composites
Most composites have strong, stiff fibres in a matrix which is weaker and less stiff. The objective is usually to make a component which is strong and stiff, often with a low density.
The most likely composite which you will use in the project is fibreglass or carbon fibre.
Download the slides for this video (1.9 MB), or the slides for any of the other videos on 'Mechanical Engineering Components'