WJEC Physics for AS Level: Revision Workbook

Answer all questions. 1. (a) A metal rod is put under a tensile stress. Explain what is meant by tensile stress, adding to the diagram. [2] rod ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... (b) Aled investigated the stretching of a brass wire using the apparatus shown: rod 0 2 4 6 8 10 0.8 0.6 0.4 0.2 0.0 extension / mm mass / kg clamp vernier wire pulley mass on hanger millimetre scale l Aled placed increasing known masses on to the hanger and measured the extension of the wire using the vernier scale. The extension was taken as zero with just the hanger attached to the wire. Aled’s plot of mass added against extension is given below. 0 2 4 6 8 10 0.8 0.6 0.4 0.2 0.0 extension / mm mass / kg 160 | WJEC Physics for AS Level: Revision Workbook | Practice papers