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.
This clip extends children's thinking about properties of materials beyond investigations they are able to carry out in the classroom. Before watching the clip, children could be given examples of Gore-Tex and tweed to handle and then make their predictions with justifications about which material is more waterproof and which is stronger. Children's predictions could then be compared to the outcomes in the testing shown in the clip and a discussion held about how their scientific thinking altered after viewing the clip.