Forces | Standard Lesson
Students explore how natural forces such as gravity, compression, tension, and shear deform Earth materials and create landforms and geologic features. In this short lesson, students connect force diagrams to real Earth processes such as mountain building, faulting, and landslides.
| Term | Definition |
|---|---|
| Force | A push or pull that can change the motion or shape of an object. |
| Stress | The force applied over an area within Earth materials. |
| Compression | A squeezing force that shortens and thickens rocks. |
| Tension | A pulling force that stretches rocks apart. |
| Shear | A sideways force that causes rocks to slide past each other. |
| Gravity | The force that pulls objects toward Earth’s center and drives many surface processes. |
| Deformation | A change in the shape or volume of rock caused by stress. |
Display a quick image of a folded mountain range or fault line and ask: 'What forces might have shaped this feature?'
Think-pair-share one idea using prior knowledge.
Briefly define stress and the three main types of stress using simple sketches on the board. Connect each to an Earth example: compression in mountain building, tension in rifting, shear in transform faults.
Take notes and label each force on a quick diagram.
Read three short Earth science scenarios and ask students to identify the dominant force and explain why. For example: a landslide on a steep slope, two plates colliding, and rocks sliding horizontally along a fault.
Respond orally or on paper, citing the correct force and evidence from the scenario.
Show one labeled or unlabeled diagram of rock layers under stress. Prompt students to infer the type of stress and predict the likely landform or geologic result.
Annotate the diagram and share a brief explanation with a partner.
Collect a quick exit ticket with one identification question and one short explanation question.
Individually complete and submit the exit ticket.
Review the three main stresses and their Earth effects, emphasizing that forces and stress shape Earth’s surface continuously. Reinforce the key idea that different force directions produce different geologic structures.
Formative assessment will be based on student responses during guided practice, diagram analysis, and the exit ticket. Success criteria: correct identification of force type, accurate use of vocabulary, and a clear explanation linking force to Earth process or landform.