Gravity & Motion in Space Lesson Plan (TEKS 7.9B): A Complete 5E Lesson for Orbits, Mass, and Newton's Law of Universal Gravitation

Chris Kesler · 10 min read

The first year I taught gravity and orbits, I tried to explain it with arrows on the board. "Here's the sun, here's the gravity pulling on Earth, here's the orbit." Kids nodded. Then on the test I'd ask why astronauts float and half the class wrote "because there's no gravity in space." I'd taught the content. They'd memorized the content. They still had the wrong picture in their head.

What finally fixed it was a tennis ball on a string. I'd stand in the middle of the room, swing it in a circle above my head, and ask, "What happens if I let go?" Every kid knew the ball would fly off in a straight line. From there it took about thirty seconds to land the idea that the string was pulling the ball inward the whole time, just like the sun pulls on Earth. Cut the string, you fly off. Keep the string, you orbit. The arrows on the board started making sense after that, not before.

That's the core idea behind this 5E lesson for TEKS 7.9B. The verb in the standard is explain, and kids can't explain a force they can't feel. They need to act it out before the diagrams will stick.

⏱ 10 class periods 📓 7th Grade Earth & Space 🧪 TEKS 7.9B 🎯 Differentiated for D + M 💻 Print or Digital

Inside the Gravity & Motion in Space 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 a 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 Gravity and Motion in Space 5E Lesson is built on this framework from start to finish. Here's how it plays out across the five phases.

🎯 Engage

📷 Engage image — objective slide OR word wall card

Day one is a teacher-led hands-on swinging-ball activity. Each student (or small group) gets a foam or tennis ball tied to a piece of string and a student sheet. Following the step-by-step teacher directions, they swing the ball in a horizontal circle, predict what will happen when they let go, and then test it.

By the end of the period, kids have a sketch of the forces acting on the ball in their student sheet, drawn in their own hand, and they can explain in their own words why the ball travels in a circle and what would happen if the string (or the gravity) suddenly disappeared. Nobody has heard a vocabulary lecture yet. That's the point. They're walking into the rest of the unit with a working mental model, not a memorized definition.

What's included in the Engage:

Teacher directions for the ball-and-string activity
Printable student observation sheet
Answer key for the discussion questions
Four learning objective slides (standard verbatim, "Explain" highlighted, "I CAN...", and "WE WILL...")
An illustrated Gravity Word Wall in English and Spanish covering the full unit vocabulary

🔬 Explore

📷 Explore image 1 — wide shot of Station Lab in action

The Gravity and Motion in Space 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 on gravity, mass, distance, and orbits and answer guided questions.
📖 Read It! A one-page reading passage at two differentiated levels, with a Spanish version included.
🔬 Explore It! A hands-on orbit activity where students model how mass and distance affect gravitational pull using marbles, a stretched fabric or rubber sheet, and a heavier center object.
💻 Research It! Reference cards with Newton's law of universal gravitation, planet mass and orbit data, and tide diagrams.

The four output stations:

📋 Organize It! A card sort where students physically place statements under "mass increases gravity," "distance decreases gravity," or "both."
🎨 Illustrate It! Students draw a labeled diagram of the Earth–Sun–Moon system showing gravitational pulls and orbital paths.
✍️ 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 vocabulary paragraph.

📷 Explore image 2 — close-up of featured station (Explore It! or Organize It!)

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 Gravity and Motion in Space 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

📷 Explain image 1 — Presentation slide screenshot

Here's the real payoff of doing the Engage and Explore before the Explain: by the time kids hit this phase, they've already swung a ball on a string and modeled gravity with marbles on a fabric sheet. 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 Gravity and Motion in Space Presentation walks 7th graders through the full scope of TEKS 7.9B, one concept at a time. The deck opens with a quick reset on what gravity is: a universal force of attraction between any two objects that have mass. From there it builds toward Newton's law of universal gravitation, which says every mass in the universe attracts every other mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The deck unpacks that idea in plain English with a series of "more mass means more pull" and "more distance means less pull" comparisons.

📷 Explain image (middle) — Presentation slide screenshot (classification hierarchy, Essential Question, or category comparison)

The middle of the deck digs into the difference between mass and weight. Mass is the amount of matter in an object and never changes. Weight is the amount of gravitational pull on that mass, so weight changes based on where you are. A 60-kilogram student on Earth weighs about 132 pounds. On the Moon, where gravity is about one-sixth as strong, that same student weighs around 22 pounds. Mass didn't change. Gravity did. Students see this with side-by-side images of a student on Earth, on the Moon, and in deep space.

From there the deck explains why the planets orbit the sun and why the moon orbits Earth. The sun has nearly all the mass in the solar system, so its gravity reaches all the way out to Neptune. Planets don't fall into the sun because they're moving sideways fast enough that the inward pull just curves their forward path into a closed loop. That combination of inward gravity and forward inertia is the key to every orbit in the system. Moons stay in orbit around their planets for the exact same reason, just at a smaller scale. The deck also addresses why astronauts on the International Space Station appear weightless. Gravity is still pulling on them at about 90 percent of its surface strength. They float because they and the station are continuously falling toward Earth together while moving forward fast enough to keep missing the planet. Tides get a short call-out as another everyday example of gravity in action.

📷 Explain image 2 — Presentation slide screenshot

For every relationship, students see a labeled diagram, a real-world comparison, and a quick formative check. That repetition (different scenarios, same three lenses: mass, distance, motion) is what bakes the explain verb of TEKS 7.9B into long-term memory.

What makes the Gravity and Motion in Space 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 (the ball-on-a-string repeat is one of them), Quick Action INB tasks (a mass and distance relationship sort, a labeled Earth orbit diagram) show up throughout, and Think About It prompts push deeper into bigger ideas like cause and effect in spacecraft navigation and the analysis of planet orbital speed data. The deck closes with a Check for Understanding tied back to the Essential Question on how gravity governs motion within Earth's solar system.

The Explain materials in this product include:

An editable 22-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 are where the real discussion happens, so let those breathe.

🛠️ Elaborate

📷 Elaborate image — Student Choice Project board or sample student work

The Elaborate phase is where students stretch what they learned about gravity and orbits and put it into a project of their choosing. In this 7th grade Earth and Space lesson, that's a Student Choice Project board with six different project options plus a "design your own" pathway.

Students might write a children's book that explains gravity to a younger sibling. They might design a poster comparing weight on different planets and moons. They might build a physical model of the Earth, Moon, and Sun showing the forces and motions involved. They might script and record a news report covering the day humans landed on the Moon and what that one-sixth gravity felt like. There are options for kids who love to write, kids who love to draw, kids who love to build, and kids who love to perform. Whatever the project, the point is the same: students apply what they know about gravity and orbital motion 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 7.9B and you actually get to see what they understand about mass, distance, and the forces that shape motion in space.

The rubric (the part teachers actually want)

Every project, no matter which option a student picks, is graded on a clear rubric with 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 gravity content. 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 diagram of two masses at different distances and ask them to predict the relative gravitational pull and then explain their reasoning.

The full assessment has 12 questions across five formats:

Multiple choice (4 questions) covering Newton's law of universal gravitation, mass versus weight, the role of gravity in orbits, and the cause of microgravity on the ISS
Hotspot / visual (2 questions) where students click or circle the diagram that shows the stronger gravitational pull and describe what they used to decide
Multiselect (2 questions) where students pick all factors that increase gravitational force or all true statements about orbital motion
Short answer (2 questions) on why astronauts appear weightless and why planets orbit the sun instead of flying off into space
Multipart scenario (2 questions) with a small-group debate where students identify which classmate's reasoning about gravity is correct and defend their pick with evidence

A modified version is included for students who need additional support. Fewer multiple-choice distractors, sentence-starter scaffolds on the short-answer items.

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 (the 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 Gravity and Motion in Space 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

Gravity & Motion in Space Complete 5E Lesson cover

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

Gravity & Motion in Space Station Lab cover

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

What you need to teach Gravity & Motion in Space (TEKS 7.9B)

Materials beyond what's in the download:

Foam or tennis balls and string (about 50 cm per setup) for the Engage activity, one set per student or small group
A stretchable fabric panel or pantyhose stretched over an embroidery hoop, plus marbles and a heavier center mass for the Station Lab Explore It! orbit model
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 7.9B — Explain how gravitational force maintains the motion of objects in space, including the orbits of planets around the sun and moons around planets. See the full standard breakdown →

Grade level: 7th 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

"There's no gravity in space"
Gravity exists everywhere in space. The International Space Station orbits about 250 miles above Earth, where gravity is still about 90 percent as strong as it is on the ground. Astronauts appear to float because they and the station are continuously falling toward Earth together while also moving forward fast enough to keep circling. Scientists call this microgravity, not zero gravity.
"Planets orbit the sun in perfect circles"
Planetary orbits are ellipses, which are stretched-out ovals, not circles. Most planet orbits are fairly close to circular, so textbook pictures simplify them, but the sun is not at the exact center. It sits at one of two points called a focus inside the ellipse. Comets have much more stretched-out elliptical orbits, which is why they swing close to the sun and then travel far away.
"Gravity only pulls things down toward the ground"
Gravity pulls two objects toward each other. On Earth, we mostly notice how Earth's gravity pulls us "down," but "down" is just "toward the center of Earth." In space, the sun's gravity pulls every planet toward the sun. Jupiter's gravity pulls its many moons toward Jupiter. Gravity works in every direction, not just downward.
"Astronauts float because they are too far from Earth for gravity to reach them"
Astronauts float because they are in continuous free-fall. They are falling toward Earth, but their forward motion is fast enough that they keep missing Earth as they go. The station is essentially falling in a curve that matches the curve of the planet. Gravity is still pulling on them the whole time.

What's included in the Gravity & Motion in Space 5E Lesson download

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

When you buy the Gravity & Motion in Space Complete 5E Lesson, you get a single download with the whole unit:

✅ Engage materials: teacher directions, student observation sheet, answer key, four learning objective slides, illustrated Gravity Word Wall (English + Spanish)
✅ The full Station Lab: 8 stations + 1 challenge, print and digital, two reading levels, Spanish Read It!
✅ Explain materials: editable 22-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. Do the ball-on-a-string demo before any vocabulary.

Kids who haven't felt the tug of the string pulling the ball inward will memorize the orbit definition and still believe gravity quits at the edge of the atmosphere. Five minutes of swinging beats fifty minutes of slides.

2. Pre-cut your card sort sets before the Station Lab.

If you let kids cut the Organize It! cards themselves, you lose 15 minutes of sorting time to scissors. Pre-cut into baggies the night before and you flip the ratio.

3. Save 10 minutes at the end of the Station Lab day for a class debrief.

Ask: "Why doesn't the Moon just fly off into space, and why doesn't it crash into Earth?" That five-minute conversation is the bridge to the Explain day.

Get the Gravity & Motion in Space 5E Lesson

Buy the full Gravity & Motion in Space 5E Lesson — $13.20

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

Buy the Gravity & Motion in Space Station Lab — $7.20

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

Frequently asked questions

Does this cover all of TEKS 7.9B?

Yes. The full standard is addressed across all five phases, including the role of gravity in maintaining planetary orbits around the sun and moon orbits around planets.

What do my students need to know before this lesson?

A basic understanding of forces, motion, and the structure of the solar system from earlier grade-level standards. If your kids can describe what a force does to an object, 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 ball-and-string 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 foam or tennis balls and string for the Engage, and a stretchable fabric panel with marbles for the Station Lab Explore It! station. Most teachers already have everything they need on hand.

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?

It aligns most directly with MS-ESS1-2 (developing and using a model to describe the role of gravity in the motions within galaxies and the solar system) and MS-PS2-4. Built TEKS-first, but the standards overlap heavily.