Parent plan · Week 26 · Work & Machines — investigate and assess — Physical Science: Matter, Forces & Energy

Parent teaching plan · 36 weeks

Units to teach or revisit

Chapter 6 · Work & Machines

Assigned readings

Chapter 6 continues one explanation across five smaller units. Questions from the launch should remain active as new evidence is added.

This week’s goals

Read the chapter launch and assigned unit sections on their linked lesson pages. Keep the launch model and return to it after each new evidence comparison.

Five flexible sessions of about 40–45 minutes. Formal papers may join consecutive sessions; take the stated total exam time. Slow down and replace a flex task with reteaching when evidence of understanding is incomplete.

Session 1 · Design a ramp for a lifting task — Plan and predict

Use three sessions: plan the question, boundary and predicted mechanism; collect safe records or analyze the supplied data; then graph, explain, compare with the initial model and propose a revision. The data option needs no special equipment. Time is a suggested allocation, not a measured completion claim.

Your task

How does ramp length change the force needed to raise the same load? Choose the safe observation or supplied-data route. Draw the boundary and initial model and define the question, variables and recording rule.

  1. Make a notice-and-wonder record. State one observation, one possible explanation and a question the investigation can address. Agree on the measuring rule before seeing the results.
  2. Specify the goal: raise the same load to the same height. Predict the effect of ramp length.
  3. Keep safety, units and the data source explicit.
  4. Explain what would support or challenge the predicted mechanism.
Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

The 1.0 m ramp uses the least force (1.8 N), but its input work is 1.8 J, compared with 1.4 J for the 0.5 m ramp. Useful output work is 5 × 0.2 = 1 J in every case. The longer ramp lowers force but does not reduce input energy in these illustrative measurements; frictional transfers differ. A space constraint may favor a shorter ramp. Calculate efficiency for each ramp and compare the design using both a space constraint and an energy criterion. Do not equate lower force with lower input energy. A complete report separates observation from inference. Preserve all planned trials, including a result that does not fit the prediction, and distinguish missing readings from zeros. The supplied numbers are illustrative, not records the learner collected. If observations differ, check the method, units and conditions before deciding which claim is supported. A schematic model should connect parts through a mechanism and explicitly name its limits. Describe a follow-up that changes one intended condition, keeps influential others comparable, and states the possible result that would challenge the explanation. A proposed improvement is not confirmed until it is retested. Different defensible conclusions can receive credit when they use the actual evidence and meet the stated criteria.

  • Calculate force, distance, and energy quantities with correct units.
  • Distinguish mechanical advantage from efficiency.
  • Use evidence and a constraint to justify a design choice.
  • Identify the system, relevant variables and measurement method.
  • Explain a model revision and a specific uncertainty.

Session 2 · Design a ramp for a lifting task — Record and analyze

Use three sessions: plan the question, boundary and predicted mechanism; collect safe records or analyze the supplied data; then graph, explain, compare with the initial model and propose a revision. The data option needs no special equipment. Time is a suggested allocation, not a measured completion claim.

Your task

Follow the method and preserve all planned records, or label and analyze the illustrative dataset. Make a graph or comparison with units, include relevant calculations, and compare outcomes.

  1. Make a notice-and-wonder record. State one observation, one possible explanation and a question the investigation can address. Agree on the measuring rule before seeing the results.
  2. Use the data or safely measure the steady pulling force for three ramp lengths. Keep the load and vertical rise fixed. Repeat measurements.
  3. Keep safety, units and the data source explicit.
  4. Explain what would support or challenge the predicted mechanism.
Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

The 1.0 m ramp uses the least force (1.8 N), but its input work is 1.8 J, compared with 1.4 J for the 0.5 m ramp. Useful output work is 5 × 0.2 = 1 J in every case. The longer ramp lowers force but does not reduce input energy in these illustrative measurements; frictional transfers differ. A space constraint may favor a shorter ramp. Calculate efficiency for each ramp and compare the design using both a space constraint and an energy criterion. Do not equate lower force with lower input energy. A complete report separates observation from inference. Preserve all planned trials, including a result that does not fit the prediction, and distinguish missing readings from zeros. The supplied numbers are illustrative, not records the learner collected. If observations differ, check the method, units and conditions before deciding which claim is supported. A schematic model should connect parts through a mechanism and explicitly name its limits. Describe a follow-up that changes one intended condition, keeps influential others comparable, and states the possible result that would challenge the explanation. A proposed improvement is not confirmed until it is retested. Different defensible conclusions can receive credit when they use the actual evidence and meet the stated criteria.

  • Calculate force, distance, and energy quantities with correct units.
  • Distinguish mechanical advantage from efficiency.
  • Use evidence and a constraint to justify a design choice.
  • Identify the system, relevant variables and measurement method.
  • Explain a model revision and a specific uncertainty.

Session 3 · Design a ramp for a lifting task — Explain and revise

Use three sessions: plan the question, boundary and predicted mechanism; collect safe records or analyze the supplied data; then graph, explain, compare with the initial model and propose a revision. The data option needs no special equipment. Time is a suggested allocation, not a measured completion claim.

Your task

Answer the analysis questions, connect evidence to the mechanism, evaluate against the criteria and propose a controlled revision. Write a 150–250-word report or an equivalent labeled visual and oral explanation.

  1. Make a notice-and-wonder record. State one observation, one possible explanation and a question the investigation can address. Agree on the measuring rule before seeing the results.
  2. Calculate input work (force × ramp distance) and useful output work (load weight × height).
  3. Keep safety, units and the data source explicit.
  4. Explain what would support or challenge the predicted mechanism.
Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

The 1.0 m ramp uses the least force (1.8 N), but its input work is 1.8 J, compared with 1.4 J for the 0.5 m ramp. Useful output work is 5 × 0.2 = 1 J in every case. The longer ramp lowers force but does not reduce input energy in these illustrative measurements; frictional transfers differ. A space constraint may favor a shorter ramp. Calculate efficiency for each ramp and compare the design using both a space constraint and an energy criterion. Do not equate lower force with lower input energy. A complete report separates observation from inference. Preserve all planned trials, including a result that does not fit the prediction, and distinguish missing readings from zeros. The supplied numbers are illustrative, not records the learner collected. If observations differ, check the method, units and conditions before deciding which claim is supported. A schematic model should connect parts through a mechanism and explicitly name its limits. Describe a follow-up that changes one intended condition, keeps influential others comparable, and states the possible result that would challenge the explanation. A proposed improvement is not confirmed until it is retested. Different defensible conclusions can receive credit when they use the actual evidence and meet the stated criteria.

  • Calculate force, distance, and energy quantities with correct units.
  • Distinguish mechanical advantage from efficiency.
  • Use evidence and a constraint to justify a design choice.
  • Identify the system, relevant variables and measurement method.
  • Explain a model revision and a specific uncertainty.

Session 4 · Chapter review and model conference

Explain how machines transfer energy, trade force for distance, and improve useful output.

Your task

Complete the complete chapter-review set for the chapter, then connect the five units to the chapter launch. Draw a revised chapter model and explain two changes supported by evidence.

  1. Attempt all assigned review prompts, including the new visual-transfer cases.
  2. Identify the two ideas with weakest explanations.
  3. Review those units’ figures and worked examples.
  4. Give an evidence-based model conference.
Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

The 1.0 m ramp uses the least force (1.8 N), but its input work is 1.8 J, compared with 1.4 J for the 0.5 m ramp. Useful output work is 5 × 0.2 = 1 J in every case. The longer ramp lowers force but does not reduce input energy in these illustrative measurements; frictional transfers differ. A space constraint may favor a shorter ramp. Calculate efficiency for each ramp and compare the design using both a space constraint and an energy criterion. Do not equate lower force with lower input energy. A complete report separates observation from inference. Preserve all planned trials, including a result that does not fit the prediction, and distinguish missing readings from zeros. The supplied numbers are illustrative, not records the learner collected. If observations differ, check the method, units and conditions before deciding which claim is supported. A schematic model should connect parts through a mechanism and explicitly name its limits. Describe a follow-up that changes one intended condition, keeps influential others comparable, and states the possible result that would challenge the explanation. A proposed improvement is not confirmed until it is retested. Different defensible conclusions can receive credit when they use the actual evidence and meet the stated criteria.

  • Show coverage of all five units.
  • Use two specific records.
  • Correct a named misunderstanding.

Session 5 · Chapter quiz and corrections

How can a machine make a task easier without creating energy?

Your task

Complete all chapter quiz questions independently before opening guidance. Have written reasoning reviewed using the criteria. Correct errors with a new explanation and identify whether reteaching is needed.

  1. Attempt the quiz with the agreed reference rule.
  2. Compare objective answers or submit written work for human marking.
  3. Discuss the evidence and mechanism behind errors.
  4. Retest a changed case after correction.
Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

The 1.0 m ramp uses the least force (1.8 N), but its input work is 1.8 J, compared with 1.4 J for the 0.5 m ramp. Useful output work is 5 × 0.2 = 1 J in every case. The longer ramp lowers force but does not reduce input energy in these illustrative measurements; frictional transfers differ. A space constraint may favor a shorter ramp. Calculate efficiency for each ramp and compare the design using both a space constraint and an energy criterion. Do not equate lower force with lower input energy. A complete report separates observation from inference. Preserve all planned trials, including a result that does not fit the prediction, and distinguish missing readings from zeros. The supplied numbers are illustrative, not records the learner collected. If observations differ, check the method, units and conditions before deciding which claim is supported. A schematic model should connect parts through a mechanism and explicitly name its limits. Describe a follow-up that changes one intended condition, keeps influential others comparable, and states the possible result that would challenge the explanation. A proposed improvement is not confirmed until it is retested. Different defensible conclusions can receive credit when they use the actual evidence and meet the stated criteria.

  • Use independent reasoning.
  • Keep pending written marks pending until reviewed.
  • Explain a corrected method.

Submit this week

Parent / teacher weekly conference

Start with the learner’s own explanation. Ask which record supports each claim, and which condition could change it. Check units, graph axes and model limits. Use supplied data without claiming it was experimentally measured at home. An oral explanation or accessible drawing can substitute for extended prose when it shows the same reasoning.

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