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Identify the class of lever system used at the knee whilst performing the back squat in Figure 3 - AQA - GCSE Physical Education - Question 15 - 2023 - Paper 1
Question 15
Identify the class of lever system used at the knee whilst performing the back squat in Figure 3. Draw a fully labelled diagram to show the class of lever identifie... show full transcript
Worked Solution & Example Answer:Identify the class of lever system used at the knee whilst performing the back squat in Figure 3 - AQA - GCSE Physical Education - Question 15 - 2023 - Paper 1
Step 1
Step 2
Draw a fully labelled diagram to show the class of lever identified in Question 15.1.
Answer
A third class lever diagram must include the following:
- Load (the weight being squatted) on one end.
- Effort (the force from the muscles) applied through the knee joint.
- Fulcrum (the knee joint) in the middle of the lever.
The diagram should visually represent these elements:
Step 3
Explain why the lever in Figure 3 has a low mechanical advantage.
Answer
The lever in Figure 3 has a low mechanical advantage due to the following reasons:
- The effort arm (distance from the knee to where the effort is applied) is shorter than the resistance arm (distance from the knee to the load).
- In third class levers, the effort is applied between the load and the fulcrum, which requires greater force to move the load. This results in a lower mechanical advantage.