Cambridge International AS & A Level · P5 · structured
Make a usable risk assessment
A2 practical 2: connect each precaution to an actual hazard · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 8
- Topics
- 2
- Answer
- Complete
For a vertical spring on a stand and clamp carrying a hanging mass and the proposed 6.0 V, 20 ohm, 0.25 W resistor circuit, write two hazard-exposure-control entries, one mechanical and one electrical. Calculate resistor power, reject or accept the operating point, and propose a quantified lower -power alternative. Give a stop condition.
- (a)
Write mechanical and electrical risk entries.
4 marks - (b)
Evaluate and revise resistor operating power.
3 marks - (c)
Give a stop condition.
1 mark
Ready to self-mark?Reveal the detailed answer guide
(a)
Write mechanical and electrical risk entries.
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
Concrete exposure-control pair for falling mass and overheating/short circuit.
(b)
Evaluate and revise resistor operating power.
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
1.8 W exceeds 0.25 W; e.g. 1.0 V produces 0.050 W.
(c)
Give a stop condition.
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
Unexpected heating, unstable clamp or permanent extension triggers stopping and teacher review.
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.
- Two complete hazard/exposure/control links: 4 marks.
- P=1.8 W and explicit rejection compared with 0.25 W rating: 2 marks.
- A quantified safe-power proposal such as 1.0 V giving 0.050 W, subject to school check: 1 mark.
- Relevant stop condition: 1 mark.
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