Substitute Guide: Newton's Laws and Transportation Safety
Learning goal (plain language)
Students learn Newton's three laws of motion — inertia (things keep doing what they're doing), F = ma (net force equals mass times acceleration), and action–reaction (equal and opposite forces) — and use them to explain why car and bus safety features protect riders in a sudden stop. Working alone with a pencil, students read a short passage, study a labeled force diagram and a data table, do a small force calculation, and write an evidence-based design recommendation. You do not need a science background to run this. Everything students need is printed in their packet. This is a paper activity — no lab, no materials, no hazards.
Standards alignment
Framework: 19 TAC §112.28 (Grade 8 Science). Knowledge & skills on force, motion, and Newton's laws.
- Provisional — 8.7 (Newton's laws): apply Newton's three laws to describe and predict the motion of objects, including in transportation-safety situations.
- Provisional — forces & F = ma: calculate and interpret net force, mass, and acceleration using F = ma; distinguish balanced and unbalanced forces.
Provisional — pending educator verification against the current official TAC source. Codes and letters are placeholders until confirmed.
(Standards are paraphrased here, not quoted. Please confirm codes and wording against your official source. This packet is does not claim formal alignment to the TEKS.)
Setup Before class (5 min)
- Count and hand out one student packet per student.
- Confirm each student has a pencil. No calculators, computers, or lab items are needed (the F = ma numbers are small and can be done by hand).
- Write the date on the board and remind students to fill in the name line.
- Keep the answer key with you — it is a separate file and is not in the student packet.
Materials What's needed
- Printed student packet (4–6 pages) per student.
- Pencil per student.
- This guide and the separate answer key (teacher only).
- No technology, no calculator, no lab equipment, no safety hazards.
Timing Suggested pacing (~45–60 min)
| Segment | Time | What students do |
|---|---|---|
| Start — Notice & Wonder | 5 min | Q1–Q2 warm-up |
| Build — Read the science | 5–10 min | Read passage, word bank, force diagram; Q3 |
| Apply — Use the data | 20–25 min | Table 1; Q4–Q7 (includes an F = ma calculation) |
| Explain — CER | 5–10 min | Q8 design recommendation (claim/evidence/reasoning) |
| Close — ACE | 5 min | Articulate / Connect / Extend |
| Continue — early finishers | optional ~15 min | Predict what changes if speed or mass changes |
Script Read aloud to start
"Today's assignment is a paper science investigation called Newton's Laws and Transportation Safety. You will work by yourself with just a pencil — no computers or calculators, and nothing to build or move. First read the short passage and study the force diagram and the data table. Then answer the questions in order; if one is tricky, skip it and come back. There is one small math step where you multiply mass times acceleration — the numbers are easy to do by hand. Write in complete sentences where it asks you to explain. You may quietly read the passage aloud to yourself. Put your name, class period, and date at the top now. You have about 45 minutes; raise your hand if you need help understanding a word."
Support When students ask for help
- You may read any part aloud to a student or the class.
- If they are stuck on "which law," point them to the Newton's three laws box and Figure 1 — each arrow matches a law.
- For the F = ma item (Q6), remind them the formula is printed: force = mass × acceleration, so 50 × 8. They do not need a calculator.
- Encourage the printed sentence stems for the CER (Q8) and ACE sections.
- Do not give answers; prompt with "What does the data show?" or "Which arrow matches this?"
- It is fine if a student cannot finish the optional early-finisher task.
Access Accommodations & language support
- Read-aloud of any passage or question is allowed for all students.
- Point students to the sentence stems and the Word Bank (definitions provided).
- Extended time is fine; the core can stop after Q8 if time runs short.
- Students may answer in phrases if writing full sentences is a barrier, as long as the idea is clear. Showing the F = ma multiplication is enough for Q6.
- The packet is grayscale-safe — it prints and reads clearly in black and white.
Tools Allowed & not allowed
Allowed: pencil, the printed packet, quiet self-read-aloud. Not needed / not allowed: calculator (the one math step is small), phones, computers, lab materials.
Teacher follow-up (for the returning teacher)
Watch for two high-value misconceptions: students calling inertia a force, and thinking action–reaction forces cancel out. A quick next-day discussion tying each of Newton's laws to one arrow in Figure 1, plus reviewing the observation-vs-inference item (Q4) and the F = ma calculation (Q6), would reinforce this well. The CER (Q8) responses show who can cite the belted-vs-unbelted force data as evidence.