O-LevelPhysicsForces5054/21 · Oct/Nov 2022 · Q18 Marks

Fig. 1.1 shows a steel spring.

(a)Describe an experimental procedure for obtaining the results needed to plot an extension-load graph for this spring.[3]
(b)(i)On Fig. 1.2, sketch the extension-load graph for this spring.[2]
(b)(ii)On your graph in Fig. 1.2, mark and label with a P the limit of proportionality.[1]
(c)The limit of proportionality for this spring occurs at a load of 8.5 N. The extension of the spring is equal to 0.014m when the load is equal to 3.5N. Calculate the extension for a load of 5.5 N.[2]

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Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

[1] measure length / attach marker
[1] attach load and measure new length and calculate extension OR attach load and read extension (using marker) against zeroed rule
[1] obtain a new result for different load OR use of rule(r) OR calculation of extension explained
[1] straight line of positive gradient from origin and for at least half of the drawn line
[1] curve of increasing gradient starting at end of straight line and never becomes vertical
[1] P marked where the gradient starts to change
[1] (x =) 0.014 × 5.5 / 3.5 or extension is directly proportional to load
[1] 0.022 m

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