Kinematics and Motion Graphs
Describing one- and two-dimensional motion using displacement, velocity, acceleration, constant-acceleration equations, graphs and projectile components.
How to study A-level Physics
Define the system, represent the physics, select a justified model, calculate transparently, then test the result against units, limits and evidence.
Core concepts
Concept 1
Velocity is the rate of change of displacement and acceleration is the rate of change of velocity.
Exam cue: Choose a positive direction and preserve signs throughout.
Concept 2
Gradient and area connect displacement-time, velocity-time and acceleration-time representations.
Exam cue: Use constant-acceleration equations only when acceleration is constant.
Concept 3
Projectile motion separates independent horizontal and vertical components under the stated force model.
Exam cue: Resolve projectile motion into perpendicular components sharing the same time.
Risk pitfalls and guardrails
Confusing distance with displacement or speed with velocity.
Guardrail: Do not substitute a memorised formula until you have identified the system, variables, direction, assumptions and valid range of the model.
Using the area under a displacement-time graph as a physical quantity.
Guardrail: Do not substitute a memorised formula until you have identified the system, variables, direction, assumptions and valid range of the model.
Assuming horizontal velocity stays constant when air resistance is significant.
Guardrail: Do not substitute a memorised formula until you have identified the system, variables, direction, assumptions and valid range of the model.
Memory anchors
Velocity
Velocity is the rate of change of displacement.
Acceleration
Acceleration is the rate of change of velocity.
Graph Gradient
The gradient of displacement-time is velocity; the gradient of velocity-time is acceleration.
Graph Area
The area under velocity-time is displacement.
Projectile Components
Horizontal and vertical motions share time but follow their own component equations.
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 completes one lap and stops at the start. Which statement is correct?
A cyclist covers 150 m in 12.0 s. What is the mean speed?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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