3.1 Planning and Controlling an Investigation
Questions and hypotheses, independent, dependent and controlled variables, equipment, ranges, intervals, repeats, risk and usable results tables.
How to study for CCEA GCSE Physics
Link every equation to a physical model and unit, interpret graphs and evidence, and prepare each prescribed practical from method through evaluation.
Core concepts
Concept 1
A testable hypothesis predicts a relationship and is supported by physical reasoning.
Exam cue: Confirm the CCEA unit, tier and whether the task tests a model, calculation, explanation or practical judgement.
Concept 2
A valid plan changes the independent variable, measures the dependent variable and controls material confounders.
Exam cue: Name both measured quantities with units, state exactly how controls are maintained and connect each risk control to the hazard.
Concept 3
Range, interval, repeats, apparatus resolution and safety controls must match the intended conclusion.
Exam cue: Show substitutions and units, connect evidence to the physical model and limit the conclusion to the stated conditions.
Risk pitfalls and guardrails
Listing generic variables or safety clothing without explaining what is controlled or why.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Importing an equation sheet, Higher-only boundary or paper convention from an England 9-1 board.
Guardrail: Use the current CCEA formatting to confirm Higher-only content and the correct paper duration; do not infer tier scope from another exam board.
Giving a calculator display or named law without the working, units, causal explanation or evidence the command word requires.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Memory anchors
Independent variable
The factor deliberately changed.
Dependent variable
The factor measured as the response.
Controlled variable
A factor kept constant for a valid comparison.
Hypothesis
A testable proposed relationship supported by reasoning.
Risk assessment
Identification of hazards, likelihood and severity, followed by suitable controls.
Resolution
The smallest change an instrument can distinguish.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which is the best testable hypothesis for an investigation of pendulum length and period?
A student varies the force on a spring and measures its extension. What is the independent variable?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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