q4
(3) A student uses a digital calliper to measure the length of a spring, as shown in Figure 10.
The spring is bendy and difficult to measure.
The student takes the six readings shown in Figure 11.
The student takes the six readings shown in Figure 11.
(a) Calculate the average length of the spring. (2)
average length = ............................................... mm
(b) The student investigates the stretching of a spring with the equipment shown in Figure 12.
The student investigates the extension of the spring using six different weights.
The results are shown in Figure 13.
The results are shown in Figure 13.
(i) Draw a graph for the readings, using the grid shown. (3)
(ii) The student writes this conclusion:
|
‘The extension of the spring is directly proportional to the weight stretching the spring.’
|
Comment on the student’s conclusion. (3)
(c) The student extends the investigation by finding information about the stretching of wires.
The student finds the graph shown in Figure 14 for the stretching of a wire.
(c) The student extends the investigation by finding information about the stretching of wires.
The student finds the graph shown in Figure 14 for the stretching of a wire.
Describe the non-linear stretching of the wire shown in Figure 14. (3)
(Total for Question 3 = 11 marks)
(Total for Question 3 = 11 marks)