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This lesson applies lever system knowledge to a range of sporting actions, as required by the Edexcel GCSE PE specification (1PE0). You need to be able to identify the class of lever, the fulcrum, load and effort for specific movements in sport, and explain why the type of lever is suited to that action. This is a common extended-answer topic on Component 1.
When analysing a sporting action as a lever system, follow these four steps:
flowchart TD
A["Identify the sporting action"] --> B["Which joint is the fulcrum?"]
B --> C["Which muscle provides the effort?"]
C --> D["What is the load/resistance?"]
D --> E["Determine F-L-E arrangement"]
E --> F["Classify: 1st, 2nd or 3rd class"]
F --> G["Explain WHY this lever class<br>suits the action"]
style A fill:#4a90d9,color:#fff
style G fill:#27ae60,color:#fff
First class levers in the body are rare. The primary sporting example involves the neck.
| Sporting Action | Fulcrum | Effort | Load | Why This Lever Class? |
|---|---|---|---|---|
| Heading a football | Atlanto-occipital joint (neck) | Neck extensor muscles (e.g. trapezius) | Weight of the head + force of the ball | The fulcrum is between the effort and load; this lever balances the head and can redirect force into the ball |
| Diving entry (head position) | Atlanto-occipital joint | Neck muscles | Weight of the head | The neck muscles control the angle of the head during entry, with the joint acting as the central pivot |
Second class levers in the body are uncommon. The primary example involves the ankle.
| Sporting Action | Fulcrum | Effort | Load | Why This Lever Class? |
|---|---|---|---|---|
| Sprinter pushing off from the blocks | Ball of the foot | Gastrocnemius (calf muscle) via Achilles tendon | Body weight through the ankle | This is a power lever — the calf muscle generates enough force to propel the entire body weight forward explosively |
| High jumper at take-off (ankle) | Ball of the foot | Gastrocnemius | Body weight | Powerful plantarflexion drives the body upward |
| Basketball player jumping for a rebound | Ball of the foot | Gastrocnemius | Body weight + gravity | The calf muscle pushes off the ground with great force |
| Gymnast performing a calf raise on beam | Ball of the foot | Gastrocnemius | Body weight | Rising onto tiptoes requires the power advantage of a second class lever |
Exam Tip: When Edexcel asks about second class levers in sport, the answer almost always involves the ankle and the gastrocnemius. Remember: ball of the foot = fulcrum, body weight = load, calf muscle = effort.
Third class levers are the most common in sport.
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