Component 1: 2.1 Lever systems — Edexcel GCSE Physical Education
Verified courseTeaching note checked against the official specification.
Component 1: 2.1 Lever systems explained
A lever is a rigid bar that rotates about a pivot (fulcrum) when effort is applied to move a load.
Read the full explanation
Levers are classified by the order of the fulcrum, load and effort along the bar. In a first class lever the fulcrum lies between the load and the effort, as in the neck when the head nods. In a second class lever the load lies between the fulcrum and the effort, as in a plantar flexion at the ankle when the body weight is raised onto the toes. In a third class lever the effort lies between the fulcrum and the load, as in the biceps curl at the elbow. Most levers in the human body are third class, which favours speed and range of movement over force. To classify a sporting action, identify the joint acting as fulcrum, the body part or resistance acting as load, and the muscle providing effort.
Your focus
- Identify the fulcrum, load and effort in a given lever system.
- Classify levers as first, second or third class based on the order of components.
- Apply lever classes to named physical activities and sporting actions.
Component 1: 2.1 Lever systems exam tips
Marking Points
- A lever consists of a fulcrum, a load and an effort acting on a rigid bar.
- First class lever: the fulcrum is between the load and the effort, for example the neck during head movement.
- Second class lever: the load is between the fulcrum and the effort, for example the ankle during plantar flexion.
- Third class lever: the effort is between the fulcrum and the load, for example the elbow during a biceps curl.
- Most levers in the human body are third class, favouring speed and range of movement.
Examiner Tips
- 💡State the order of fulcrum, load and effort before naming the lever class.
- 💡Apply each class to a named sporting action, identifying the joint, the load and the muscle effort.
- 💡Remember that most body levers are third class, so check whether the effort is in the middle before deciding.
Common Mistakes
- Confusing second and third class levers: correction — in a second class lever the load is in the middle, while in a third class lever the effort is in the middle.
- Assuming all body levers are first class: correction — most body levers are third class, with the effort between fulcrum and load.
- Naming a joint as the fulcrum without identifying the load and effort: correction — all three components must be identified to classify the lever correctly.