Chapter 03WBCHSE BoardClass XIPhysics
Laws of Motion & Friction
গতির সূত্র ও ঘর্ষণ
Newton's laws of motion, free body diagrams, connected body systems, conservation of momentum, and static and kinetic friction.
0 Core Topics
1 Study Materials
Syllabus Reference Module
Target Learning Objectives
- Construct accurate Free Body Diagrams (FBD) for multi-body constraint systems.
- Apply Newton's second law in inertial and non-inertial reference frames using pseudo-forces.
- Derive the law of conservation of linear momentum from Newton's third law.
- Calculate static friction limits, kinetic friction, and angle of repose.
Governing Physical Concepts
- Inertia & Momentum (p = mv)
- Impulse & Impulse-Momentum Theorem
- Free Body Diagrams & Pulley Constraints
- Static vs Kinetic Friction (fs <= μs N, fk = μk N)
- Centripetal Force & Banking of Circular Tracks
Structured Concept Hierarchy
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PRACTICEv2026.1 • ENGLISH
Laws of Motion & Friction: Graded Problem Set with Solutions
Thirty curated mechanical problems progressing from standard board constraint systems to multi-block inclined planes and banking equations.
12 PagesOpen Resource
Quick Revision Summary
“Friction is an intelligent self-adjusting force up to its maximum static threshold. Always verify whether applied force exceeds static limit.”
- •Normal reaction is perpendicular to the contact surface, not always equal to mg.
- •In connected pulley systems, set up acceleration equations along the string tension direction.
- •Optimum banking velocity without friction: v = sqrt(rg tan θ).
Structured Practice Roadmap
Comprehensive problem set focusing on multi-block systems, inclined planes, and pulley tension.
Problem Bank Volume:30 Selected Problems
Problem Categories:
Pulley Constraint SystemsFriction on InclineCircular Banking
Unit Diagnostic 03: Dynamics & Friction
Assessment Architecture • Academic Evaluation SpecificationHigh-rigor assessment featuring multi-body constraint problems.
FormatWritten Sectional Paper
Duration60 Minutes
Coverage22 Questions
* Note: Written assessments are administered and reviewed directly by faculty. Digital diagnostic assessment engines are scheduled for subsequent platform phases.