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
Learning Curves, Theories and Stages
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
Biomechanical Principles
Momentum, impact and impulse
- 3 things to know
- A2 Unit 3
Overview
Momentum and its unit with a worked rugby example, impulse as a vector with a worked sprint start, impulse and momentum, force–time graphs for a sprinter, landing safely and impact.
What you need to know
Answer each one before you reveal it.
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Key term
What do force–time graphs show for a sprinter at the start and at constant velocity?
Key term
What is momentum?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is momentum?
Model answer
Momentum is the quantity of motion a body has. Momentum equals mass multiplied by velocity.
- 2
What is the unit of momentum?
Model answer
Momentum is measured in kilogram metres per second (kg m s⁻¹).
- 3
A 90 kg rugby player runs at 7 m s⁻¹. What is the player's momentum?
Model answer
The momentum is 630 kg m s⁻¹. The working is 90 kg × 7 m s⁻¹ = 630 kg m s⁻¹.
- 4
Why is a heavy, fast-moving player hard to stop?
Model answer
A heavy, fast player has large momentum. A large force or impulse is needed to change it.
- 5
What is impulse?
Model answer
Impulse is force multiplied by the time for which it acts. Impulse is measured in newton seconds (N s).
- 6
Why is impulse a vector quantity?
Model answer
Impulse has both size and direction. The direction is that of the force applied.
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