Suggested sequence: 70 minutes, split across sessions as needed. Use this introduction within your wider learning plan. Print sheets to record learner work; this page does not save learner responses.
Lesson plan
Materials
Rigid lightweight beam with defined attachment points; broad securely fixed fulcrum; small restrained load; travel stops; a calibrated push-capable force sensor or correctly arranged spring scale; ruler; tray; paper. An adult constructs and checks the rig. An unsupported ruler balancing over a pencil is not the specified setup.
Safety
The adult operates the mechanism and secures the fulcrum, load and travel limits. Keep all hands clear of pivot and beam pinch points. Use only lightweight model loads and a low lift. Do not extrapolate the classroom model to lifting a person or heavy object.
Teaching Sequence
| Find out first | 5 minutes | Ask whether a longer lever always reduces the effort and where its pivot must be. |
|---|---|---|
| Read the story | 15 minutes | Read pages 1–20, pausing at the ideal model and pulley comparison. |
| Teach explicitly | 10 minutes | Identify the three lever parts. Model output-force/input-force and the perpendicular arm-length ratio. Discuss movement distance and real losses. |
| Investigate and practise | 30 minutes | Compare two adult-secured lever arrangements with small loads and an appropriate force sensor. Complete the recording table. |
| Review and extend | 10 minutes | Explain the evidence and ideal-model limits. Solve the numerical example only when ratio prerequisites are secure. |
Timing is a suggested introductory sequence, not a legally required duration. Split it across sessions as needed.
Story teaching stops
Open a page below, then use Lesson & Guide in the book to return here.
Page 02 — Load, fulcrum and effort
Page 05 — Changing lever arm lengths
Page 06 — Force and distance trade-off
Page 08 — Ideal lever model: pause and discuss
Page 09 — Real apparatus and model limits
Educator guide
Primary Subject
Science
Secondary Connections
Ratios, force measurement, controlled comparisons and technical explanation
Curriculum Connection
Alberta’s existing Science Grades 7–9 Program of Studies includes Grade 8 Unit D Mechanical Systems. This guide introduces simple machines and develops lever reasoning within that unit. Draft 7–9 curriculum is kept separate from the existing program.
Scope
Introduced: levers, pulleys, work, mechanical advantage and efficiency. Developed and assessed: a lever comparison, force and movement trade-offs, and ideal-versus-real reasoning. Still needed: broader mechanical systems, further quantitative work, hydraulics and the other chosen unit outcomes.
Prerequisites
Use ratios and read force in newtons; distinguish mass from weight; measure from the pivot to each force point. Numerical extensions can follow an initial observation lesson. The ideal model ignores friction and beam weight unless explicitly included.
Publisher Learning Objectives
1. Identify load, fulcrum and effort and describe how changing arm lengths affects a lever.
2. Compare arrangements using the same secured load and recorded arm lengths.
3. Explain the force-distance trade and a difference between an ideal prediction and real apparatus.
Vocabulary
Fulcrum: pivot of a lever. Load: object or resistance being moved. Effort: applied input force. Mechanical advantage: output force divided by input force. Work: force multiplied by displacement in its direction in this simplified case. Efficiency: useful output work divided by input work, often expressed as a percentage.
Educator discussion questions and answer guidance
1. What changed when the fulcrum moved?
Answer guidance: The effort-to-load arm ratio changed. With a longer effort arm relative to the load arm, the ideal required effort decreases for the same load.
2. What did easier force cost in movement?
Answer guidance: The effort point travels farther than the load point. A machine does not create energy by reducing effort force.
3. Why might real results differ?
Answer guidance: Friction, beam weight, force direction, sensor calibration and apparatus deformation are valid limits.
Ideal worked example, not a measured result: effort arm 20 cm divided by load arm 10 cm gives ideal mechanical advantage 2. A 1 N load would require 0.5 N effort in the ideal model. If the load rises 1 cm, the effort point moves 2 cm in this arrangement. Both give 0.01 J of ideal work. Real readings can differ because the simplified model excludes beam weight and losses.
Adaptations And Extension
Begin with a qualitative adult demonstration and let the learner dictate observations. Extend by comparing a fixed pulley with a two-supporting-segment movable arrangement using an accurately drawn rope path.
Next Lesson
Investigate further mechanical systems and develop work and efficiency calculations through explicit teaching. Record only the selected concepts actually assessed here as covered.
Canadian Home Education Use
Canada has provincial and territorial home-education frameworks rather than one national required subject list. These pilots retain the report’s Alberta-first planning approach. Families elsewhere can reuse the stories while matching the guides to their own approved or parent-selected plan and local requirements. In Alberta, parents choose resources consistent with the Home Education Regulation and are responsible for planning and evaluating the program. Use these dated work samples within that wider plan.
Curriculum And Home Education References
Government of Alberta. Existing Science Grades 7 8 9 Program of Studies updated 2009 and 2014. https://open.alberta.ca/publications/5360861-updated-2009-2014
Government of Alberta. Current and draft science program distinction. https://www.alberta.ca/curriculum-science
Government of Alberta. Home education. https://www.alberta.ca/home-education
Connection checked October 2 2026. Exact official outcome identifiers must be verified for the chosen pathway before any claim of complete alignment.
Activity sheets
Main Activity
Compare lever arrangements
Materials
Rigid lightweight beam with defined attachment points; broad securely fixed fulcrum; small restrained load; travel stops; a calibrated push-capable force sensor or correctly arranged spring scale; ruler; tray; paper. An adult constructs and checks the rig. An unsupported ruler balancing over a pencil is not the specified setup.
Safety
The adult operates the mechanism and secures the fulcrum, load and travel limits. Keep all hands clear of pivot and beam pinch points. Use only lightweight model loads and a low lift. Do not extrapolate the classroom model to lifting a person or heavy object.
Method
1. Use a beam long enough for the stated arms. Start with load and effort force points 10 cm from the pivot on opposite sides. Attach the same small secured load and record the apparatus.
2. The adult applies a perpendicular downward effort slowly with a suitable force sensor. Record the effort while just supporting the raised load, plus effort-end travel and load rise. Repeat three times with the same procedure.
3. Lower and secure the load before moving the fulcrum. Use a 10 cm load arm and 20 cm effort arm. Repeat three measurements with the same load, force direction and lift height.
4. Compare effort forces and movement distances. Calculate actual mechanical advantage only if output force has also been measured. State how beam weight, friction or sensor alignment could affect the comparison.
Learner recording sheet
Name: ________________________ Date: ______________
Our prediction and reason
Labelled lever diagram: load, fulcrum and effort
Recorded arm lengths and secured load
Conditions we keep the same
Force sensor and units / adult setup notes
| Arrangement and trial | Effort force N | Effort travel cm | Load rise cm |
|---|---|---|---|
| 10 cm to 10 cm trial 1 | ________ | ________ | ________ |
| 10 cm to 10 cm trial 2 | ________ | ________ | ________ |
| 10 cm to 10 cm trial 3 | ________ | ________ | ________ |
| 20 cm to 10 cm trial 1 | ________ | ________ | ________ |
| 20 cm to 10 cm trial 2 | ________ | ________ | ________ |
| 20 cm to 10 cm trial 3 | ________ | ________ | ________ |
Compare effort force and movement distance across both lever arrangements
Explain the force-distance trade using our observations
One difference between the ideal model and our actual apparatus
Assessment & progress
Evidence
Keep a dated labelled hand-drawn lever diagram, arm lengths, three measurements per arrangement, a calculation if appropriate and a conclusion stating a limitation. Record the learner’s independence and the adult’s setup work.
Success Criteria
Assess correct parts and force units, comparable trials, sound ratio reasoning and an explanation of the distance trade. Do not equate ideal mechanical advantage with real efficiency.
Parent Progress Record
Portfolio record: learner name or initials; date; province or territory; chosen home-education pathway; parent-selected outcome; curriculum version if used; task evidence; assistance given; assessment judgement; next teaching step. Topic connections in these pilots are not exact official outcome-code mappings. Parents using provincial outcomes should add the verified identifiers from the chosen current program before recording full coverage.
Learner / date
Province or territory / home-education pathway
Selected outcome and curriculum version
Evidence retained
Assistance provided
Judgement: Developing / Secure for this task / Applying
Next teaching step