Laws of Motion in Systems Lesson Plan (TEKS 8.7B): A Complete 5E Lesson for Newton's Three Laws in Action

Chris Kesler · 10 min read

The first year I taught Newton's laws, I taught them as a list. First law one day, second law the next, third law the day after. By the end of the week, my kids could recite each law back to me word for word. Then the test would ask, "Which laws are at work when a rocket launches?" and they would freeze.

The fix came from a trick I called "law hunting." I'd pull up a 30-second clip of a skater landing a trick, a dog jumping off a couch, or a kid stomping on a skateboard, and the job was to spot all three laws in the same clip. Pause. Point. Argue. "That's first law. No, third law. Look at the ground." Once they could find all three laws living together in a single video, they stopped seeing Newton's laws as a memorized list and started seeing them as the script behind every motion they watched.

That's exactly the leap TEKS 8.7B is asking for, and it's what's built into this 5E lesson for TEKS 8.7B. Students don't just learn Newton's three laws. They learn to see them working simultaneously inside real-world systems like cars, sports, rides, plate tectonics, and rocket launches.

⏱ 10 class periods 📓 8th Grade Physics 🧪 TEKS 8.7B 🎯 Differentiated for D + M 💻 Print or Digital

Inside the Laws of Motion in Systems 5E Lesson

The 5E instructional model walks students through five phases: Engage, Explore, Explain, Elaborate, and Evaluate. It flips the traditional lecture-first sequence on its head. Students explore the concept hands-on before you ever explain it, which means by the time you do explain it, they have something to hook the vocabulary onto.

I switched to the 5E model years ago and stopped going back. Kids retain more, ask better questions, and stop staring at me waiting to be told the answer. The Laws of Motion in Systems 5E Lesson is built on this framework from start to finish. Here's how it plays out across the five phases.

🎯 Engage

Day one is a teacher-led hands-on Engage where small groups run three short demos at their tables. A coin on a card on top of a cup (flick the card, the coin drops in, first law). A toy car loaded with different masses pushed with the same force (second law). A balloon pinched closed, then released to fly across the table (third law). Following the step-by-step teacher directions, students rotate through all three and predict, observe, and explain what they saw.

By the end of the period, kids have a one-page sketch of all three demos on their student sheet, and they can describe in their own words what each law is doing. Nobody has heard a lecture on inertia, F = ma, or action-reaction pairs yet. That's the point. They walk into the rest of the unit with a working mental model for each of Newton's three laws, not a memorized definition.

What's included in the Engage:

Teacher directions for all three demo stations
Printable student observation sheet
Answer key for the discussion questions
Four learning objective slides (standard verbatim, "Investigate and describe" highlighted, "I CAN...", and "WE WILL...")
An illustrated Force and Motion Word Wall in English and Spanish covering the full unit vocabulary

🔬 Explore

The Laws of Motion in Systems Station Lab is the heart of the Explore phase. Students rotate through 8 stations (plus a 9th challenge station for early finishers) over one class period. The Station Lab is split into four input stations (where kids take in new information) and four output stations (where they show what they learned).

The four input stations:

🎬 Watch It! — Students watch a short video of a real-world system (a rocket launch, a sports highlight, an amusement park ride) and answer guided questions identifying all three of Newton's laws at work.
📖 Read It! — A one-page reading passage at two differentiated levels, with a Spanish version included.
🔬 Explore It! — The hands-on activity. Students set up a balloon rocket on a fishing line and predict, then measure, how mass and force changes affect the launch (all three laws show up in a single run).
💻 Research It! — Reference cards on Newton's three laws, the action-reaction pairs in common systems, and worked examples for vehicle restraints, sports, and rocket launches.

The four output stations:

📋 Organize It! — A card sort where students match real-world systems (a seatbelt, a tackle, a roller coaster, a rocket) to the laws at play.
🎨 Illustrate It! — Students draw a system of their choice and label every place Newton's first, second, and third laws appear.
✍️ Write It! — Three open-ended questions in complete sentences (this is where you see who really gets it).
📝 Assess It! — A short formative check with multiple choice and a fill-in-the-blank "which law is which" paragraph.

Print and digital versions are both included. If you want the full breakdown of what happens at every single station, what students produce, and how to set it up, that's in our dedicated Station Lab post.

→ Read the full Laws of Motion in Systems Station Lab walkthrough 8 stations, materials list, teacher tips

The Station Lab is included in the full 5E lesson. You don't need to buy it separately if you're getting the whole unit.

📚 Explain

Here's the real payoff of doing the Engage and Explore before the Explain: by the time kids hit this phase, they have already pulled the card out from under the coin, watched a balloon rocket fire across the room, and argued out loud about which law was working when. They have a working understanding before you ever start naming things. The discussions get deeper, the questions get sharper, and you spend less time defining and more time pushing their thinking.

The Laws of Motion in Systems Presentation walks 8th graders through the full scope of TEKS 8.7B, one concept at a time, with diagrams and real-world systems on nearly every slide. The deck opens with a quick reset on motion (a change in position over time requires a force) and Isaac Newton himself, then names each of the three laws in plain language and gets students using them right away.

Newton's First Law (the law of inertia) says an object will remain at rest or in constant motion in a straight line unless acted upon by an unbalanced force. The deck uses balanced versus unbalanced forces to make this concrete (when forces cancel, the object keeps doing whatever it was doing) and ties it to a seatbelt scenario where a deer jumps in front of a car. Newton's Second Law (the law of acceleration) reinforces F = ma from 8.7A. Acceleration increases with more force and decreases with more mass. Newton's Third Law (the law of action and reaction) says every action force is met by an equal and opposite reaction force. The action and reaction are always the same size and always in opposite directions.

The real shift in 8.7B is that students stop looking at the laws one at a time and start analyzing systems where all three apply at once. The deck walks through that exact move with several familiar systems: tectonic plates (first law explains plates at rest staying at rest, second law explains why massive plates accelerate slowly, third law explains the equal-and-opposite push when two plates collide), sports (a basketball stays at rest until you throw it, the harder you throw it the faster it returns, and when it hits the ground the ground pushes back with the same force), vehicle restraints (a seatbelt provides the unbalanced force that overcomes your inertia in a sudden stop, while the second and third laws describe what's happening to the car), amusement park rides (every push you feel on a roller coaster is paired with an equal push back), and rocket launches (the rocket sits on the launchpad in inertia until thrust ignites, then expels hot gas downward to push itself upward in a perfect action-reaction pair).

What makes the Laws of Motion in Systems Presentation different from a typical physics slideshow is that kids are doing something on almost every single slide. It's not a lecture deck. It's a participation deck. "Your answer:" prompts appear on most slides, Brain Breaks reset attention every few slides, Quick Action INB tasks (a toy-car-on-a-ramp arrow task and a skateboard park design challenge) show up throughout, and Think About It prompts push deeper into bigger ideas like Aristotle's outdated theory of motion and how the same skateboard trick is all three laws happening at once. The deck closes with a Check for Understanding tied back to the Essential Questions: What are Newton's laws of motion? and How can Newton's three laws act simultaneously within a system?

The Explain materials in this product include:

An editable 28-slide Presentation at two differentiated levels (Dependent and Modified), works in PowerPoint or Google Slides
A guided fill-in-the-blank student notes handout that mirrors the Presentation, with answer key
A Paper Interactive Notebook (English and Spanish) students cut, fold, and glue into their notebooks
A Digital Interactive Notebook at both levels with answer keys, for 1:1 classrooms or Google Classroom

The Explain runs across two class periods. The built-in Think About It prompts (especially the tectonic plates and rocket launch ones) are where the real discussion happens, so let those breathe.

🛠️ Elaborate

The Elaborate phase is where students stretch what they learned about Newton's three laws of motion and put it into a project of their choosing. In this 8th grade physics lesson, that's a Student Choice Project board with six different project options plus a "design your own" pathway.

Students might design a new amusement park ride and label every place Newton's three laws show up, write a sportscaster-style play-by-play of a touchdown that names each law as it happens, or build a model rocket and explain why it works in space (a place where there's nothing to push off of). There are options for kids who love to build, kids who love to write, kids who love to draw, and kids who love to perform. Whatever the project, the point is the same: students apply Newton's three laws in systems to a real-world artifact instead of a worksheet.

Choice is the whole point. By letting students pick how they show their thinking, you get more authentic work for TEKS 8.7B and you actually get to see what they understand about Newton's laws working together.

The rubric (the part teachers actually want)

Every project, no matter which option a student picks, is graded on the same 100-point rubric. Five categories at 20 points each:

Vocabulary (20 pts) — At least four words from the lesson are used in context.
Concepts (20 pts) — At least two key concepts from the lesson are referenced.
Presentation (20 pts) — The project grabs attention and is well-organized.
Clarity (20 pts) — Easy to understand. Free of typos.
Accuracy (20 pts) — Drawings and models are accurate. The science is right.

The rubric uses a minus / check / plus shorthand on every row so you can grade a stack of projects quickly without re-reading every criterion.

Two differentiated versions in one file

The standard version is for students ready for independent application of Newton's three laws. The Reinforcement version is for students who need additional vocabulary or concept support. Three of the six options are swapped for projects with a tighter vocabulary tie-in, and "design your own" is replaced with "collaborate with the teacher" so kids aren't pitching cold.

✅ Evaluate

The Evaluate phase wraps the unit with a formal assessment. It's not all bubble-in. Several questions hand students a real-world system (a car braking, a rocket launching, a soccer ball getting kicked) and ask them to identify which of Newton's laws are at work and explain how.

The full assessment has 12 questions across five formats:

Multiple choice (4 questions) covering inertia, F = ma, action-reaction pairs, and the difference between balanced and unbalanced forces
Hotspot / visual (2 questions) where students identify the action and reaction in a labeled system and describe what each arrow represents
Multiselect (2 questions) where students pick all of Newton's laws at work in a given system
Short answer (2 questions) on why a rocket can launch in the vacuum of space and why a seatbelt isn't really "holding you to the car"
Multipart scenario (2 questions) with a 3-student classroom debate where kids identify which reasoning is correct and which law each student is using

A modified version is included for students who need additional support. Fewer multiple-choice distractors, sentence-starter scaffolds on the short-answer items, and a one-page laws-of-motion reference printed on the page.

If you've taught all five phases, this assessment shouldn't surprise anyone. It's a chance for kids to show you they get it.

How everything fits together

If you want the whole experience (Engage hook, the Station Lab as the Explore, the Explain day with Presentation and interactive notebook, the Student Choice Elaborate, and the Evaluate assessment all in one download), that's the Laws of Motion in Systems Complete 5E Science Lesson.

If you only need the one-day hands-on activity, the Station Lab works as a standalone. Most teachers buy the full 5E because the Station Lab works harder when it's bookended by a strong Engage and a follow-up Explain. But both are honest options.

Two options

Laws of Motion in Systems Complete 5E Lesson cover

Full 5E Lesson — ~10 class periods $13.20 Get the 5E Lesson

Laws of Motion in Systems Station Lab cover

Just the Station Lab — 1–2 class periods $7.20 Get the Station Lab

What you need to teach Laws of Motion in Systems (TEKS 8.7B)

Materials beyond what's in the download:

Index cards, coins, and plastic cups for the first-law coin drop demo (one set per group)
Small toy cars and a stack of pennies or small weights for the second-law mass demo
Round balloons and fishing line for the balloon-rocket Explore It! activity (a straw, a piece of tape, and a length of fishing line stretched across the room)
Pencils, colored pencils or markers, and printed student pages
A device with internet for the Watch It! station and the slide deck

Standard covered: Texas TEKS 8.7B — Investigate and describe how Newton's three laws of motion act simultaneously within systems such as in vehicle restraints, sports activities, amusement park rides, Earth's tectonic activities, and rocket launches. See the full standard breakdown →

Grade level: 8th grade science

Time: About 10 class periods of 45 minutes each, done with fidelity. The product also ships with a compressed sample unit plan if you need to move faster.

Common misconceptions this lesson clears up

"A rocket pushes off the ground to launch"
A rocket does not need the ground to push against. It works the same way in outer space, where there is nothing to push off of. The engine fires hot gas downward at high speed, and by Newton's Third Law, the gas pushes the rocket upward with an equal and opposite force. The rocket pushes the gas, and the gas pushes the rocket. That's the real action-reaction pair.
"When two objects collide, the heavier one hits the lighter one with more force"
This trips up a lot of students. By Newton's Third Law, the forces in a collision are equal in size. If a truck hits a bike, the truck pushes on the bike with the same size force that the bike pushes on the truck. The reason the bike gets wrecked and the truck doesn't isn't the force. It's the mass. The same force produces a huge acceleration on the small mass (the bike) and a tiny acceleration on the large mass (the truck). That's Newton's Second Law working on top of the Third Law.
"In sports, a ball stops moving because it runs out of force"
A ball doesn't carry a supply of force inside it. Once it leaves the player's hand, foot, or bat, the only forces acting on it are gravity, air resistance, and whatever it hits. The ball slows down because friction and air resistance are pushing back on it. Newton's First Law says the ball would keep moving forever if nothing slowed it down, but in the real world, something almost always does.
"Seatbelts protect you because they hold you to the car"
Seatbelts are a Newton's First Law story. When a car stops suddenly, the car gets pushed backward by the crash, but your body keeps moving forward at the same speed because of inertia. A seatbelt applies a backward force on your body, slowing you down with the car so you don't keep moving into the windshield. The belt isn't holding you to the car. It's supplying the force that overcomes your inertia.

What's included in the Laws of Motion in Systems 5E Lesson download

📷 Inside-the-product — add screenshot of Read It passage or sample answer sheet

When you buy the Laws of Motion in Systems Complete 5E Lesson, you get a single download with the whole unit:

✅ Engage materials — teacher directions for all three mini-demos, student observation sheet, answer key, four learning objective slides, illustrated Force and Motion Word Wall (English + Spanish)
✅ The full Station Lab — 8 stations + 1 challenge, print and digital, two reading levels, Spanish Read It!
✅ Explain materials — editable 28-slide Presentation at two differentiated levels (with built-in Brain Breaks, Quick Action INB tasks, and Think About It prompts), guided fill-in-the-blank student notes handout with answer key, Paper Interactive Notebook (English + Spanish), Digital Interactive Notebook at two levels with answer keys
✅ Elaborate (Student Choice Projects) — 6 project options + design-your-own, plus a Reinforcement version with vocabulary-focused alternatives, 5-category rubric included
✅ Summative assessment — full 12-question version and modified version with sentence-starter scaffolds, both with answer keys
✅ Sample 8-day unit plan — day-by-day pacing guide

A couple of real-talk tips from running this lesson

1. Run the balloon-rocket Explore It! before you ever teach Newton's third law.

Kids who release a balloon down a fishing line have already lived the action-reaction pair. They watch the gas fire one way and the balloon fly the other. After that, the third law isn't an abstract idea. It's the thing they just did.

2. Use short video clips for "law hunting" during the Explain.

A 30-second skateboard clip or a clip of a kid jumping into a pool. Pause it, point at one frame, and ask, "Which law is happening here?" Then play it forward five frames and ask again. That muscle of pausing and naming the law is exactly what 8.7B is asking for.

3. Don't let the rocket-launch misconception slide on Day 1.

If a kid says, "The rocket pushes off the ground," stop and address it right there. Once it sticks, it's hard to unstick. Show a clip of a rocket firing in space and ask, "What is it pushing off of?" Five minutes of cleanup early on saves a whole class period of cleanup at test time.

Get the Laws of Motion in Systems 5E Lesson

Buy the full Laws of Motion in Systems 5E Lesson — $13.20

Or if you only need the one-day hands-on Station Lab:

Buy the Laws of Motion in Systems Station Lab — $7.20

(The Station Lab is included in the full 5E Lesson)

Frequently asked questions

Does this cover all of TEKS 8.7B?

Yes. The full standard is addressed across all five phases, with the "investigate and describe" verbs baked into the Engage demos, the Station Lab, and the Student Choice Project.

What do my students need to know before this lesson?

A working understanding of Newton's Second Law from 8.7A is helpful but not required. If your kids can describe what a push or pull does to an object and have a basic sense of mass and acceleration, they're ready.

How long does it take to teach?

Done with fidelity, about 10 class periods of 45 minutes each: one day for the three-demo Engage, two days for the Station Lab, two days for the Presentation and Interactive Notebook, three days for the Student Choice Project, and one to two days for review and the assessment. The product also ships with a compressed 8-day sample unit plan if you need to move faster.

Do I need special supplies?

Just index cards and coins for the first-law demo, toy cars for the second-law demo, and balloons plus a length of fishing line for the third-law balloon rocket. Most of it is dollar store stuff or already in your supply closet.

Does this work for digital classrooms?

Yes. Every component has a digital version. The Station Lab is fully digital-ready (Google Slides), the Presentation works in Google Slides, and the Student Choice Projects can be submitted as videos, slide decks, or written work.

Is this 5E lesson aligned to NGSS too?

Yes. It aligns most directly with MS-PS2-1 (applying Newton's Third Law to design a solution to a problem involving the motion of two colliding objects). Built TEKS-first, but the standards overlap heavily.