Chapter 06WBCHSE BoardClass XIPhysics
Gravitation
মহাকর্ষ
Kepler's laws of planetary motion, Newton's law of universal gravitation, gravitational field and potential, escape velocity, and satellite orbital mechanics.
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0 Study Materials
Syllabus Reference Module
Target Learning Objectives
- Derive Kepler's laws of planetary motion from gravitational first principles.
- Determine variation of acceleration due to gravity with altitude, depth, and Earth's rotation.
- Calculate gravitational potential energy and escape velocity from celestial bodies.
- Analyze geostationary and polar satellite orbital dynamics.
Governing Physical Concepts
- Kepler's Three Laws of Planetary Motion
- Universal Gravitational Law (F = G m1 m2 / r^2)
- Variation of g (Height, Depth, Latitude)
- Gravitational Potential (V = -GM/r) & Potential Energy (U = -GMm/r)
- Escape Velocity (v_e = sqrt(2GM/R)) & Orbital Velocity (v_o = sqrt(GM/R))
Structured Concept Hierarchy
Chapter Topics & Breakdown
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Academic Library
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Quick Revision Summary
“Gravitational force is an inverse-square conservative central force.”
- •At depth d below Earth surface: g' = g(1 - d/R).
- •At height h (h << R): g' = g(1 - 2h/R).
- •Total mechanical energy of a bound satellite is negative: E = -GMm / (2r).
Structured Practice Roadmap
Syllabus-standard problems on satellite orbital shifts, escape velocity, and gravity variation.
Problem Bank Volume:20 Selected Problems
Problem Categories:
Satellite EnergyEscape SpeedGravity at Depth/Altitude
Unit Diagnostic 06: Gravitation
Assessment Architecture • Academic Evaluation SpecificationSectional paper covering planetary physics and orbital mechanics.
FormatWritten Sectional Paper
Duration50 Minutes
Coverage16 Questions
* Note: Written assessments are administered and reviewed directly by faculty. Digital diagnostic assessment engines are scheduled for subsequent platform phases.