Whole Earth Curriculum WEC

Lesson 06 — Gravity: A Force That Acts at a Distance

Learners describe gravity as a force that pulls at a distance: Earth pulls every object toward its center, no touching needed. They predict and test how objects fall, explain why the Moon orbits without falling into us, and separate the evidence they can see from the invisible force they infer.

D06 P3: Intellectual & Cognitive Awareness D06.S3 50 minutes Draft

Objectives

Essential question

How can gravity pull on something it is not even touching?

gravityforceattractmassorbitdistanceevidenceinference

Materials

Standard materials

Low-tech / no-cost

Enriched / lab & device

Works in different contexts

A gravity diagram. A large circle labeled Earth sits in the lower center, with arrows at several points on its surface pointing straight toward the Earth's center, labeled 'gravity pulls toward Earth's center.' A person and a tree stand on the surface. A dropped ball above the Earth has an arrow pointing down toward the center. In the upper corner, the Moon is shown with a curved orbit path around the Earth and a weaker arrow labeled 'gravity also pulls on the Moon.' A caption reads: gravity is a pull that acts at a distance, with no touching. Labels and shapes, not color alone, carry the meaning so it prints clearly in grayscale.
A gravity diagram. A large circle labeled Earth sits in the lower center, with arrows at several points on its surface pointing straight toward the Earth's center, labeled 'gravity pulls toward Earth's center.' A person and a tree stand on the surface. A dropped ball above the Earth has an arrow pointing down toward the center. In the upper corner, the Moon is shown with a curved orbit path around the Earth and a weaker arrow labeled 'gravity also pulls on the Moon.' A caption reads: gravity is a pull that acts at a distance, with no touching. Labels and shapes, not color alone, carry the meaning so it prints clearly in grayscale.

Lesson 6 — Gravity: A Force That Acts at a Distance

Summary

Learners describe gravity as a force that acts at a distance: Earth pulls every object toward its center without touching it. They predict and test how objects fall, discover that air — not gravity — is why a leaf falls slowly, and explain how gravity reaches the Moon across empty space to hold it in orbit.

Objectives

  • Describe gravity as a force that acts at a distance. (D06.S3.05.02)

Connection

Drop a stone anywhere on Earth — in a market in Lagos, a field in the Andes, a village in the Himalayas — and it falls the same way: down. “Down” means toward Earth’s center, which is why people on opposite sides of the planet both stand firmly on the ground instead of sliding off. The Moon never falls on us, yet it stays near us, pulled the whole time. Something invisible is at work. That something is gravity.

Materials

  • Gravity diagram
  • Two different small objects to drop (a stone and a leaf, or a ball and a feather)
  • Gravity prediction page

Preparation

  • Print or draw the gravity diagram and a prediction page per learner.
  • Have clear floor space and two objects per pair to drop.
  • Recall Grade 3: a push or pull is a force that changes motion.

Facilitator note

Written to the learner (“you”). Two ideas to land: (1) gravity is a pull toward Earth’s center that acts at a distance — no contact; (2) the drop test separates gravity (pulls on everything) from air resistance (why a leaf falls slowly). The worked example here is the classic one: predict “heavier falls faster,” then drop a heavy and a light compact object (same air effect) and observe they hit together — the habit of predicting before testing is the point. Gravity being stronger for more massive objects is a Grade 7 topic; keep it simple now: everything is pulled, and the pull is toward the center, and it reaches across space. The claim that gravity pulls on all objects is evidence-based science; the idea that “down” is the same direction for every human being can also seed a gentle global/egalitarian reflection — but keep that as a value, not a science claim (docs/facilitation.md).

Procedure

  1. Gather (5 min). Jump in place. What pulled you back down? Nothing touched you. Write your first guess: that guess is a prediction about an invisible force.
  2. Meet gravity (10 min). Look at the diagram. Gravity is a force — a pull — that acts between any two objects at a distance, without touching. Earth pulls every object toward its center. That is why “down” points to the center everywhere on Earth, and why the Moon, far away in space, is still pulled into an orbit around us.
  3. Predict, then test (15 min). On your page, write your prediction: which falls faster, a stone or a leaf — and why? Now drop both from the same height and observe. What did you see? The stone and the leaf are both pulled by gravity; the leaf falls slowly because air pushes back on it more. Now drop two compact objects of different mass (a big stone and a small stone) — predict first. What happened?
  4. Evidence and inference (10 min). You can see things fall (evidence). You cannot see gravity itself — you infer it from what falls, from the Moon orbiting, from the tides. Sort these: “the stone fell” (evidence); “an invisible pull made it fall” (inference); “the Moon is pulled by Earth” (inference from orbit). Which is which?
  5. Close (5 min). Gravity is the reason your feet stay on the ground, rain falls, and the Moon keeps circling. It pulls on everything, everywhere, all the time — and it never needs to touch.

Differentiation

  • Support: Do the drop test together and provide a two-box record (predict | saw). Focus on “down = toward Earth’s center” with the diagram.
  • Extension: Explain why astronauts on the Moon can jump much higher (the Moon is smaller, so its pull is weaker), and predict what gravity would feel like on a much larger planet.

Assessment

  • Formative (observation): Can the learner state that gravity pulls toward Earth’s center at a distance, and explain the leaf result using air (not gravity)?
  • Self-check: The learner asks, “Can I name one thing I saw (evidence) and one thing I inferred (gravity)?”

Home connection

Drop two small, compact objects of different weights from the same height (outside, with permission). Predict first, then watch. Tell someone what happened and what it shows about gravity.

Resources