Linear and Angular Motion
Analyse translation, rotation, angular momentum and the relationship between linear and angular movement.
How to study A-level Physical Education theory
Learn the mechanism, apply it to a precise sporting context, use quantitative or source evidence where relevant and reach a supported judgement.
Core concepts
Concept 1
Linear motion uses distance, displacement, speed, velocity and acceleration to describe translation.
Exam cue: Distinguish scalar distance and speed from vector displacement and velocity.
Concept 2
Angular motion uses angular displacement, velocity and acceleration about an axis.
Exam cue: Identify the axis and distribution of mass before predicting angular velocity.
Concept 3
Angular momentum depends on moment of inertia and angular velocity and is conserved when external torque is negligible.
Exam cue: Use a graph's gradient or area only after identifying what its axes represent.
Targeted study blocks
Knowledge for written assessment
Secure the shared theoretical core
Secure linear and angular definitions, equations, units, graphs, torque, moment of inertia and conservation of angular momentum.
Apply and evaluate
Turn knowledge into a supported sporting judgement
Calculate or infer a change in motion and explain how body shape, force application or mass distribution affects the result.
Risk pitfalls and guardrails
Using speed and velocity interchangeably in a directional calculation.
Guardrail: Do not replace theoretical explanation with an activity-specific technique description or practical-performance instruction.
Claiming angular momentum is always conserved despite an external torque.
Guardrail: Do not replace theoretical explanation with an activity-specific technique description or practical-performance instruction.
Assuming a smaller moment of inertia reduces angular velocity when momentum is conserved.
Guardrail: Do not replace theoretical explanation with an activity-specific technique description or practical-performance instruction.
Memory anchors
Speed
Speed is distance divided by time and has magnitude only.
Velocity
Velocity is displacement divided by time and includes direction.
Acceleration
Acceleration is the rate of change of velocity.
Angular momentum
Angular momentum equals moment of inertia multiplied by angular velocity.
Moment of inertia
Moment of inertia depends on mass and how far it is distributed from the axis.
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 400 m lap and finishes at the starting point. What are distance and displacement?
A cyclist covers 150 m in 12 s. What is 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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