These are similar to one and two mark questions but you will be expected to write in more depth for three and four mark questions.
Edexcel questions courtesy of Pearson Education Ltd.
A student finds the graph shown in the figure for the stretching of a wire.
Describe the non-linear stretching of the wire shown in the graph. [3 marks]
Above 37.5 N there are large increases of extension for small increases in load . The maximum extension of the wire is about 16.5 mm before it breaks . Above 12 mm the wire keeps on extending when the load is reduced below 46 N .
Make sure you describe three separate features of the graph clearly and use numbers from the graph in your answer.