O-LevelPhysicsForcesOct/Nov 2025Paper 3 Q314 Marks
In this experiment you will use a balancing method to determine the mass of a metre rule. You have been provided with: • a metre rule with a millimetre scale • a triangular block to act as a pivot • slotted masses making a total of 100 g. (a) Place the metre rule on the pivot. Place a mass m = 20g on the metre rule with its centre at the 5.0 cm mark. Adjust the position of the metre rule on the pivot until the metre rule is as close to balance as possible. The mass must stay at the 5.0 cm mark. [Figure 3.1] shows the balanced metre rule. [Figure 3.1]
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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