Parent plan · Week 21 · Motion — apply and extend — Physical Science: Matter, Forces & Energy

Units to teach or revisit

Chapter 5 · Motion

Assigned readings

A soft bumper stops a toy differently

Chapter 5 continues one explanation across five smaller units. Questions from the launch should remain active as new evidence is added.

This week’s goals

Explain the assigned questions using named mechanisms and relevant records.
Read the labeled figures and distinguish observations from inferences.
Revise an explanation after checking its evidence and assumptions.

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 · Collisions, Deformation & Changes in Motion — connect and test

Kinetic energy is energy associated with motion. In the same simplified situation, more mass at the same speed means more kinetic energy, and doubling speed gives four times the kinetic energy. During stopping, energy can transfer into temporary deformation, thermal changes, sound and surroundings.

Your task

Study Parts 3–4. Answer both checkpoints and the figure question, then work the whole-unit application with intermediate steps. Use the labeled figures and “Read the visual model” question in the assigned part; explain an attempted answer before opening guidance.

Read Parts 3–4 in manageable sections.
Name the graph axes, quantities or receivers in the figure.
Attempt the application before reading its model.
Check reasoning, units and the case assumptions.

Hint and response guidance

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

No. It influences motion energy, but material response, geometry and how the object stops also affect damage. Lower measured peak force for this padded setup under the stated matched conditions. They do not certify every pad or establish identical average forces or injury protection.

Use the specified quantities and units.
Explain an intermediate step or comparison.
Connect the pattern to the physical mechanism.
State an assumption or limitation.

Session 2 · Collisions, Deformation & Changes in Motion — practise and revise

Illustrative matched-cart tests show bumper thickness 15 mm before, 8 mm during and 15 mm afterward; peak force is 12 N rather than 24 N for a rigid stop.

Your task

Study the worked examples, complete the unit practice and retrieval questions, then return to the phenomenon and explain the model change. Complete the exit check; use the sustained tasks for additional depth or a needed correction. Use the labeled figures and “Read the visual model” question in the assigned part; explain an attempted answer before opening guidance. Complete the new illustrated practice and independent visual-transfer case for this unit.

Explain a worked example with the answer covered.
Attempt independent questions and record reasoning.
Use feedback to correct a specific error.
Revise the initial model and answer the exit check without notes.

Hint and response guidance

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

The bumper undergoes elastic deformation in this simplified record because it regains its thickness. The padded peak is half the rigid-stop peak under matched conditions. Deformation can allow a longer stopping interval, but the readings do not prove that every object is protected or give the entire force–time history. Energy is redistributed rather than erased.

Use the supplied evidence.
Explain a mechanism or calculation.
Correct rather than erase an error.
Identify a limit or remaining question.

Session 3 · Designing & Revising a Collision Protector — observe and build

Illustrative evidence case. Illustrative designs have A: mean peak 13 N, thickness 4 cm; B: mean peak 9 N, thickness 7 cm. Maximum permitted thickness is 5 cm. The unit’s visible language notes define the scientific words before the main reading.

Your task

Make the first model, read the core explanation and Parts 1–2, then answer their reasoning checks. Describe the associated figure using labels and caption. Use the labeled figures and “Read the visual model” question in the assigned part; explain an attempted answer before opening guidance.

List two observations and one question.
Sketch an initial explanation before opening guidance.
Read the language notes and explain Parts 1–2 in plain words.
Attempt both checkpoints; discuss and revise.

Hint and response guidance

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

A fixed rule allows consistent judgments and avoids changing success criteria to favor a preferred design. No. It can lower pressure for the same force by spreading contact area, but total force depends on the stopping interaction.

Keep observations distinct from causes.
Use the defined terms correctly.
Connect the model to stated evidence.

Session 4 · Designing & Revising a Collision Protector — connect and test

Hold starting speed, payload mass, collision direction, surface and measuring procedure comparable. Repeat with fresh or restored samples when previous deformation affects results. Keep all planned measurements, including inconvenient failures. A mean is the sum divided by the number of readings; a range is maximum minus minimum.

Your task

Read Parts 3–4 in manageable sections.
Name the graph axes, quantities or receivers in the figure.
Attempt the application before reading its model.
Check reasoning, units and the case assumptions.

Hint and response guidance

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

It omits its other readings and variability. Evaluate all planned trials along with constraints and damage observations. No. Features can interact and violate limits. The revised design requires new tests under the same evaluation rules.

Use the specified quantities and units.
Explain an intermediate step or comparison.
Connect the pattern to the physical mechanism.
State an assumption or limitation.

Session 5 · Designing & Revising a Collision Protector — practise and revise

Illustrative designs have A: mean peak 13 N, thickness 4 cm; B: mean peak 9 N, thickness 7 cm. Maximum permitted thickness is 5 cm.

Your task

Explain a worked example with the answer covered.
Attempt independent questions and record reasoning.
Use feedback to correct a specific error.
Revise the initial model and answer the exit check without notes.

Hint and response guidance

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

A qualifies under the thickness rule; B does not despite its lower mean peak. Start with A and investigate whether a more compressible arrangement within 5 cm lowers the peak. Repeat matched tests, record all results and evaluate permanent deformation as well as force. Lower mean peak alone is not universal protection.

Use the supplied evidence.
Explain a mechanism or calculation.
Correct rather than erase an error.
Identify a limit or remaining question.

Submit this week

Dated notebook entries and the assigned evidence or graph work.
An attempted model, revised model and the evidence behind the change.
Practice corrections or a human-reviewed assessment, as assigned.

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.

Can the learner explain the core mechanism without copying?
Can they read the new figure and identify a limit?
Which error needs a different explanation or worked example next session?

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