Forces | Small Group
In this 15-minute small-group lesson, students analyze how unbalanced forces and energy transfer move Earth materials and shape landforms. Using quick observations and a guided discussion, they connect force, motion, and change on Earth’s surface.
| Term | Definition |
|---|---|
| force | A push or pull that can change an object’s motion or shape. |
| gravity | The force that pulls objects toward Earth. |
| friction | A force that resists motion when surfaces rub together. |
| erosion | The movement of weathered material by water, wind, ice, or gravity. |
| deposition | The dropping off or settling of sediment in a new place. |
Show two images of a riverbank or sand dune. Ask, “What force moved this material?” Prompt students to name the evidence they see.
Observe closely, make a prediction, and share one idea using force vocabulary.
Review force as a push or pull. Briefly explain that gravity pulls materials downhill, moving water carries sediment, wind can move sand, and friction slows motion. Connect these forces to erosion and deposition.
Listen, take brief notes, and answer quick questions with partners.
Direct students to build a small slope with the tray/paper, add a thin layer of sand or soil, and pour a small amount of water. Ask them to observe what changes and where material collects. Circulate and ask: “What force is acting here?” and “Where is deposition happening?”
Work together to set up the model, observe movement, and record cause-and-effect statements.
Bring the group together to compare observations. Ask students to name one force, one effect, and one piece of evidence from the model or images.
Share concise responses and use vocabulary in complete sentences.
Prompt students to write or say: “One force that shapes Earth is ___ because ___.” Collect responses as a quick assessment.
Complete the exit response individually.
Reinforce that Earth’s surface is constantly changing because forces move materials from one place to another. Emphasize that students saw both movement (erosion) and settling (deposition) in the model.
Formative assessment through teacher observation, discussion responses, and the exit check statement. Look for correct identification of a force, a change in motion, and an example of erosion or deposition.
Find one example of a force shaping Earth at home or outside (wind, water, gravity, or ice). Write 3–4 sentences describing the force, what it moved or changed, and what evidence you observed.