Chapter 04WBCHSE BoardClass XIPhysics
Work, Energy & Power
কার্য, শক্তি ও ক্ষমতা
Work done by variable forces, kinetic and potential energy functions, work-energy theorem, conservative forces, and 1D/2D collisions.
0 Core Topics
1 Study Materials
Syllabus Reference Module
Target Learning Objectives
- Compute work done as the line integral of force: W = ∫ F · dr.
- Derive and apply the Work-Energy Theorem for variable force systems.
- Analyze conservative force fields and deduce potential energy curves U(x).
- Calculate post-collision velocities in perfectly elastic and inelastic collisions.
Governing Physical Concepts
- Scalar Work & Vector Dot Product
- Work-Energy Theorem: W_net = ΔK
- Conservative vs Non-Conservative Forces
- Spring Elastic Potential Energy (1/2 k x^2)
- Coefficient of Restitution (e) & Collision Dynamics
Structured Concept Hierarchy
Chapter Topics & Breakdown
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Academic Library
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REVISIONv2026.1 • BILINGUAL
Work, Energy & Power: Spaced Retention Revision Digest
High-yield summary comparing conservative and non-conservative forces, potential energy wells, and coefficient of restitution collision criteria.
6 PagesOpen Resource
Quick Revision Summary
“Conservative forces allow potential energy definition: F = -dU/dx. Stable equilibrium occurs at potential energy minima.”
- •Kinetic energy is conserved only in perfectly elastic collisions (e = 1).
- •Linear momentum is conserved in all collisions if external net force is zero.
- •Power is instantaneous dot product: P = F · v.
Structured Practice Roadmap
Extensive problem set on spring systems, vertical circular loops, and collision mechanics.
Problem Bank Volume:25 Selected Problems
Problem Categories:
Vertical Circle DynamicsSpring-Mass Oscillations1D/2D Elastic Collisions
Unit Diagnostic 04: Energy & Collisions
Assessment Architecture • Academic Evaluation SpecificationSectional assessment focusing on energy conservation and restitution.
FormatWritten Sectional Paper
Duration60 Minutes
Coverage20 Questions
* Note: Written assessments are administered and reviewed directly by faculty. Digital diagnostic assessment engines are scheduled for subsequent platform phases.