Two different fabrics, Gore-Tex and tweed, are tested to determine which fabric is most suitable for wear. The first test is for strength - the fabrics are stretched and the force measured in Newtons. This is followed by testing the weight of each material when dry and wet. Finally, the materials are tested for waterproofing.
The children could use the ideas in the clip to devise their own experiment to test the suitability of different materials for a purpose, eg for use in a lollipop lady's coat. The children could then test how waterproof each material is and also how hardwearing.