Cambridge International AS & A Level · P5 · structured
Write an evidence-based revision memo
A2 practical 10: plan, perform, evaluate, then revise · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 6
- Topics
- 1
- Answer
- Complete
Using only the constructed pilot notes, write a proposed revision memo: name the limiting measurement, calculate the predicted timing improvement, specify what the next supervised run must record, and state which conclusions cannot yet be claimed. This written task must not be marked as completed apparatus experience. Constructed illustrative data (not observed experimental evidence). Raw pilot notes: five complete cycles took 3.3 s with about 0.2 s uncertainty for the timed interval; some runs became elliptical; the unloaded spring length increased after the heaviest load. Evaluate a proposed timing interval of 20 complete cycles, expected to take about 13.2 s if the period is unchanged.
- (a)
Quantify the proposed revision.
3 marks - (b)
Specify required new evidence.
2 marks - (c)
State what is not yet established.
1 mark
Ready to self-mark?Reveal the detailed answer guide
(a)
Quantify the proposed revision.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
About6.1% to 1.5% timing uncertainty using20 cycles if damping/counting remain suitable.
(b)
Specify required new evidence.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
Actual raw repeated times, uncertainty/controls, deviations and assistance recorded in an approved supervised run.
(c)
State what is not yet established.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
Neither observed improvement nor practical competence has been demonstrated by the written constructed-data task.
Complete marking guidance
Use these worked steps alongside the part-by-part answers. They explain the method and mark allocation; they do not add extra marks.
- Specific limitation and numerical6.1%/1.5% comparison:2 marks.
- Workable revised20-cycle procedure with damping/counting control:1 mark.
- Concrete original-data and assistance/deviation record for actual supervised execution:2 marks.
- Explicitly distinguish proposed improvement from measured outcome and written preparation from apparatus competence:1 mark.
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