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
Linear and Angular Motion
Acceleration and graphs of motion
- 3 things to know
- A2 Unit 3
Overview
Acceleration and its unit with a worked sprint start, deceleration, velocity–time graphs of a 100 m sprinter, gradients and areas, speed–time and velocity–time graphs, and using graphs to coach a sprinter.
What you need to know
Answer each one before you reveal it.
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Key term
What is the unit of acceleration?
Key term
A sprinter goes from rest to 9 m s⁻¹ in 3 s. What is the average acceleration?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is acceleration?
Model answer
Acceleration is the rate of change of velocity. Acceleration equals the change in velocity divided by the time taken.
- 2
What is the unit of acceleration?
Model answer
Acceleration is measured in metres per second squared (m s⁻²).
- 3
A sprinter goes from rest to 9 m s⁻¹ in 3 s. What is the average acceleration?
Model answer
The average acceleration is 3 m s⁻². The working is (9 − 0) m s⁻¹ ÷ 3 s = 3 m s⁻².
- 4
What is deceleration?
Model answer
Deceleration is a decrease in velocity over time. Deceleration is negative acceleration.
- 5
How is acceleration shown on a velocity–time graph?
Model answer
Acceleration is the gradient of a velocity–time graph. A steep upward line shows rapid acceleration.
- 6
Describe the velocity–time graph of a 100 m sprinter.
Model answer
The line rises steeply as the sprinter accelerates from the blocks. The line then levels off at maximum velocity and falls slightly near the finish.
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