Metacentric height and upright stability are the focus of this Grade 8 Science Fluids resource, helping students explain why a floating body returns upright after a small tilt or becomes more likely to capsize. Students connect the centre of gravity (CG), centre of buoyancy (CB), metacentric height (GM), and righting moments to practical vessel stability.

⚓ Explore What Makes a Floating Body Stable

The reading passage introduces how the centre of gravity and centre of buoyancy affect stability. Students examine why the centre of buoyancy shifts when a floating body tilts and how that shift changes the direction of the buoyant force. The resource explains metacentric height as the distance between the CG and metacentre and connects positive, small, and negative GM values with the initial righting response and capsizing risk.

Students also investigate how weight distribution, ballast, cargo position, hull shape, and waterline area influence stability. Moving cargo lower can lower the centre of gravity, while a wider hull can produce a stronger restoring effect as buoyancy shifts. These relationships provide a foundation for interpreting stability margins and loading conditions.

📐 Apply Stability Concepts

Students work through multiple-choice questions, true-or-false statements, short responses, a matching activity, a cloze passage, an extended-response scenario, and a Did You Know section. Tasks ask students to identify conditions that support initial stability, explain changing buoyancy during a tilt, interpret positive and negative GM, describe how loading changes the centre of gravity, and identify factors affecting buoyancy shifts.

The extended response applies the concepts to a small-boat loading scenario. Students explain design or loading actions that can improve stability and reduce capsizing risk while referring to CG, CB or buoyancy shifting, and GM or righting moment.

📚 Complete Teaching Support

• Student worksheet covering upright stability, metacentric height, buoyancy, loading, and righting moments
• Separate PDF answer key for checking student responses
• Student Notes & Lesson Summary supplement for reinforcing key concepts
• Separate Teacher Guide with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes

🌊 Classroom Applications

Use this Grade 8 Science worksheet for instruction, guided practice, independent work, review, or reinforcement in an Ontario Fluids lesson. The progression from reading and concept recognition to explanation and application gives students opportunities to connect fluid behaviour with vessel design and loading decisions.

For teachers covering Ontario Grade 8 Science Fluids, this resource provides focused practice with centre of gravity, centre of buoyancy, metacentric height, righting moments, stability margins, trim, and capsizing risk, supported by materials for both student learning and teacher-led instruction.