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Practical Investigation · Part 2 of 5
3 exam-style questions with model answers, plus 4 quick multi-choice questions — every question on this part of the standard, grouped by the 1 page of notes they come from.
Write a full answer before you reveal the model one. That comparison is where the learning happens.
In an investigation of how the period of a mass on a spring depends on the mass, state two variables that should be controlled.
Describe how you would control the amplitude in an investigation of how the period of a mass on a spring depends on the mass, and explain why it needs controlling.
A student measuring the resistance of a wire against its length uses a digital multimeter, takes three repeats at each length, and reports a very small random uncertainty — but their line has a clear positive intercept.
Evaluate their approach to accuracy and justify two changes.