3.1 Motion: How do objects move?
Calculate and represent speed and acceleration, interpret motion graphs and explain safe stopping.
How to study WJEC GCSE The Sciences
Move from a scientific model to a prediction or method, collect or interpret evidence, show quantitative working and finish with a conclusion whose limits match the data.
Core concepts
Concept 1
Calculate speed, distance, time and acceleration with consistent units.
Exam cue: Identify the unit, entered tier, supplied reference material, command word and relevant scientific enquiry skill.
Concept 2
Interpret gradients and areas on motion graphs at the specified scope.
Exam cue: State the graph quantity represented by a gradient or area before calculating and attach the correct unit.
Concept 3
Separate thinking and braking distance and explain factors affecting each.
Exam cue: Use scientific terminology, show quantitative working with units, and connect conclusions to data and the stated model.
Concept 4
Official subtopics: 3.1.1 Speed, distance, time and acceleration; 3.1.2 Using equations to calculate speed and acceleration; 3.1.3 Graphs illustrating motion; 3.1.4 Safe stopping of vehicles.
Concept 5
Scientific enquiry and mathematical skills apply in this topic; bold amplification is Higher Tier only.
Risk pitfalls and guardrails
Confusing speed with acceleration or treating thinking distance and braking distance as interchangeable.
Guardrail: Do not import outgoing 3430QD content, another science route, a fixed required-practical list or unsupported tier and connection assumptions.
Recalling a fact without applying it to the observation, data, practical method or unfamiliar context.
Guardrail: Use the live secure pack: Task A may use groups of up to three; Task B is individual and highly controlled. Two enquiries are selected by the centre from three.
Importing content, required practicals, tier rules or paper structure from the outgoing WJEC or another awarding-body route.
Guardrail: Bold amplification is Higher-only. Units 1-6 may mix tiers, but Unit 7 is untiered.
Memory anchors
Speed
Distance travelled per unit time.
Velocity
Speed in a stated direction.
Acceleration
Change in velocity per unit time.
Thinking distance
Distance travelled during the driver's reaction time.
Braking distance
Distance travelled after braking begins until the vehicle stops.
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
A runner covers 150 m in 25 s. What is the mean speed? Keep distance, time, speed and acceleration units consistent throughout the reasoning. Choose the claim with the strongest scientific support.
How does velocity differ from speed? Keep distance, time, speed and acceleration units consistent throughout the reasoning. Use the direction of change as well as its size.
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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