lever systems
4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.
Lesson Overview
Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Learning Objectives
- Explain the key ideas of lever systems
- Apply lever systems to exam-style questions
- Develop independent study skills
- Build cross-topic connections
Prerequisites
- Read the revision notes for lever systems first (GCSE Revise summary)
- Key vocab to pre-teach: A lever system, Arrangement, Arrangement
- Basic skills: reading the summary notes and answering the practice questions there
Materials & Equipment
- Exercise book, coloured pens
- Ruler
- Printed revision notes (link below)
- Internet for videos (see Resources)
Lesson 1: Introduction: lever systems
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Write down everything you already know about lever systems. Then check against the key terms: A lever system, Arrangement, Arrangement. Use a mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: A lever system, Arrangement, Arrangement.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Before lesson: Read the script below. Pre-teach key vocab: A lever system, Arrangement, Arrangement.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: lever systems. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Physical Education because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
Mins 0-5 - Hook: "Today: lever systems. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Physical Education because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
First Look
Start with the revision notes summary, then attempt: Name the three components of a lever system and explain what each represents in the human body.
Plenary (5 minutes)
Check Out
Your student states one thing they learned and one question they still have about lever systems.
Lesson 2: Core Concepts: lever systems
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from Lesson 1 on lever systems. Check them against the notes below.
Main Content (35 minutes)
A lever system: is made up of three components arranged along a rigid bar (the lever itself - which in the body is a bone):
Arrangement: The fulcrum is between the effort and the load. F - E - L or E - F - L (Fulcrum in the middle)
Arrangement: The load is between the fulcrum and the effort. F - L - E (Load in the middle)
Mechanical Advantage: Second class levers always have a mechanical advantage because the effort arm is longer than the load arm. This means a smaller effort can move a larger load - the body can lift its own weight using the relatively small force generated by the calf muscles.
Arrangement: The effort is between the fulcrum and the load. F - E - L (Effort in the middle)
Mechanical Disadvantage: Third class levers have a mechanical disadvantage because the effort arm is shorter than the load arm. A larger effort force is needed to move a smaller load. However, the advantage is a greater range of movement and speed - the load moves faster and further than the point where effort is applied.
| Term | Meaning | Example |
|---|---|---|
| First class | F in the middle | Depends on position of F |
| Second class | L in the middle | Yes (MA > 1) |
| Third class | E in the middle | No (MA < 1) |
Practice (10 minutes)
Q: Name the three components of a lever system and explain what each represents in the human body.
Answer: Fulcrum (F) = the pivot point (a joint in the body); Effort (E) = the force applied (a muscle contracting); Load (L) = the resistance being moved (body weight or external object). The lever itself is the bone.
Plenary (5 minutes)
Explain Back
Your student teaches the key points back to you without looking. Fill any gaps immediately.
Lesson 3: Application: lever systems
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Recall the key terms: A lever system, Arrangement, Arrangement. Define each in one sentence.
Main Content (35 minutes)
Parent/Teacher Guide: Let your student attempt each question alone first, then compare with the model answer. Award method marks for correct working even if the final answer is wrong.
Q1: Name the three components of a lever system and explain what each represents in the human body.
Answer: Fulcrum (F) = the pivot point (a joint in the body); Effort (E) = the force applied (a muscle contracting); Load (L) = the resistance being moved (body weight or external object). The lever itself is the bone.
Q2: Describe the arrangement of components in a second class lever and give an example from the body.
Answer: In a second class lever, the load is in the middle (F - L - E). The fulcrum is at one end, the load is between the fulcrum and the effort, and the effort is at the other end. Body example: plantar flexion - fulcrum at the ball of the foot, load at the ankle (body weight), effort from the gastrocnemius pulling on the heel.
Q3: Explain why third class levers have a mechanical disadvantage but are still beneficial for movement.
Answer: Third class levers have a mechanical disadvantage because the effort arm is shorter than the resistance arm (MA < 1), meaning more effort is needed to move the load. However, the benefit is that the load moves through a greater range of movement and at a faster speed than the point where effort is applied, which is essential for the large, rapid movements required in most sports.
Q4: Calculate the mechanical advantage if the effort arm is 15 cm and the resistance arm is 5 cm.
Answer: MA = effort arm ÷ resistance arm = 15 ÷ 5 = 3. The lever has a mechanical advantage of 3.
Q5: Identify the lever class when performing a bicep curl, explaining the position of each component.
Answer: A bicep curl is a third class lever. Fulcrum = elbow joint; Effort = biceps muscle contracting (inserts on the radius, between the elbow and hand); Load = weight in the hand. The effort is in the middle, making it a third class lever.
Q6: Why is the second class lever at the ankle important for sprinting?
Answer: During sprinting, the foot acts as a second class lever during the push-off phase. The fulcrum at the ball of the foot, the load of body weight at the ankle, and the effort from the gastrocnemius at the heel create a mechanically advantageous system. This means the relatively small force from the calf muscles can lift the entire body weight, generating the powerful propulsive force needed for sprinting.
Plenary (5 minutes)
Error Review
Review any questions answered incorrectly. Identify whether the error was knowledge, method, or reading the question.
Lesson 4: Exam Practice: lever systems
Duration: 50 minutes
Starter Activity (5 minutes)
Command Words
Review what these command words require: state (one point), describe (say what happens), explain (say why), compare (both sides), evaluate (judgement).
Main Content (35 minutes)
Exam-Style Question
Attempt a past-paper style question on lever systems from the exam board past paper finder (see Resources), then mark it against the scheme.
Exam Tips: Remember: F = Fulcrum (joint), E = Effort (muscle), L = Load (weight) | Identify which component is IN THE MIDDLE to determine the lever class | First class = Fulcrum in middle; Second class = Load in middle; Third class = Effort in middle | Second class levers ALWAYS have mechanical advantage (effort arm > load arm) | Third class levers are the MOST COMMON in the body | Practise labelling diagrams of levers - this is a common exam format
Common Errors: Watch Out! Students often think second class levers are the most common in the body. Wrong: Second class levers are the most common in the body Correct: Third class levers are the most common in the human body (e.g. biceps curl, hamstring kick). They favour range of movement and speed over force. Students often think the effort is always at the muscle. Wrong: The effort is always at the muscle Correct: The effort is where the muscle inserts on the bone, not where the muscle belly is. The insertion is usually close to the joint (fulcrum), creating a third class lever. Students often think planes and axes are the same thing. Wrong: Planes and axes are the same thing Correct: A plane is a flat
Stretch & Challenge (Grade 8-9):
- Synoptic links: explain how lever systems connects to another Physical Education topic you have studied
- Real-world: research one real-world use or example of lever systems
- Critical: "What are the limitations of the models used in lever systems?"
Plenary (5 minutes)
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts - re-run Lesson 2
Homework & Consolidation
- Consolidation: Re-answer any Lesson 3 practice questions answered incorrectly (20 mins)
- Retrieval: Write flashcards for the key terms: A lever system, Arrangement, Arrangement (10 mins)
- Exam practice: One past-paper question on lever systems from the board websites (15 mins)
- Extension: Explain lever systems to someone else in your own words (10 mins)