Key term
WJEC A-Level Physical Education 601-8485-1
Performance Analysis and Fitness Testing
Levers and Movement Analysis
Joints and the Musculo-Skeletal System
Components of Fitness and Methods of Training
Energy Systems and Principles of Training
Fatigue, Recovery and Rehabilitation
Diet, Nutrition and Hydration
Personality
Stress, Arousal and Anxiety
Motivation and Self-Efficacy
Skill, Ability and Skill Classification
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Transfer, Practice, Guidance and Feedback
Sport, Culture and Society
The Emergence of Modern Sport
Social Differentiation in Sport
Short-Term Responses to Exercise
Long-Term Adaptations to Exercise
Carbohydrate Loading and Supplements
Biomechanical Principles
Linear and Angular Motion
Projectile Motion and Fluid Mechanics
Attitudes
Aggression
Social Facilitation
Group Dynamics and Leadership
Attribution Theory
Information Processing and Memory
Ethics, Deviance and Doping
Sport and the Mass Media
Commercialisation and Globalisation
Linear and Angular Motion
Moment of inertia and conservation of angular momentum
- 3 things to know
- A2 Unit 3
Overview
Moment of inertia and the radius of gyration, angular momentum and its conservation, the diver and skater changing spin with a worked example, body shape and opening out before entry.
What you need to know
Answer each one before you reveal it.
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Key term
What is moment of inertia?
Key term
What factors affect moment of inertia?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is moment of inertia?
Model answer
Moment of inertia is the resistance of a rotating body to a change in its angular motion. The unit is kilogram metres squared (kg m²).
- 2
What factors affect moment of inertia?
Model answer
Moment of inertia depends on the mass of the body and how the mass is distributed about the axis. Mass further from the axis increases it.
- 3
What is the radius of gyration?
Model answer
The radius of gyration describes how far the mass is spread from the axis of rotation. A larger radius gives a larger moment of inertia.
- 4
What is angular momentum?
Model answer
Angular momentum is the quantity of rotation a body has. Angular momentum equals moment of inertia multiplied by angular velocity.
- 5
What is the conservation of angular momentum?
Model answer
Angular momentum stays constant during flight unless an external torque acts. Changes in body shape change the spin rate, not the angular momentum.
- 6
How does a diver speed up a somersault?
Model answer
The diver tucks, bringing mass closer to the axis and reducing moment of inertia. Angular velocity increases to keep angular momentum constant.
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