Motion Graphs and Acceleration
Translate motion into velocity-time evidence and use gradient and signed area with correct units.
How to study National 5 Physics
Move from a physical situation to a model, relationship, calculation and evidence-based conclusion, while using current official documents for exact assessment conditions.
Core concepts
Concept 1
Acceleration is the change in velocity divided by time.
Exam cue: Read the axes and units before interpreting a graph.
Concept 2
The gradient of a velocity-time graph gives acceleration.
Exam cue: Use two well-separated points on the relevant straight segment for a gradient.
Concept 3
The signed area under a velocity-time graph gives displacement.
Exam cue: Split compound areas into rectangles and triangles and preserve signs.
Risk pitfalls and guardrails
Treating graph height as acceleration.
Guardrail: Check the model, assumptions, prefixes, units, significant figures and whether every conclusion is supported by evidence.
Calling negative velocity deceleration in every case.
Guardrail: Choose a direction convention and distinguish signed vector quantities from scalar magnitudes.
Ignoring below-axis area when determining displacement.
Guardrail: Check the model, assumptions, prefixes, units, significant figures and whether every conclusion is supported by evidence.
Memory anchors
Acceleration
Final velocity minus initial velocity, divided by time.
V-t gradient
Acceleration.
V-t area
Displacement.
Horizontal V-t line
Constant velocity and zero acceleration.
Negative velocity
Motion in the defined negative direction.
Acceleration experiment
Measure velocity change and the associated time interval.
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
On a velocity–time plot, which quantity is obtained from the line's gradient?
Areas above and below the time axis are combined with signs on a velocity–time graph. What do they give?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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