Elastic Potential Energy Class 11 Physics||Force Extension Graph NBF Physics||By Danish Majeed

Elastic Potential Energy Class 11 Physics || Force Extension Graph NBF Physics || By Danish Majeed ✨

Topic: Stress Strain Curve
Link:    • Stress Strain Curve Class 11 Physics||Phys...  

In this comprehensive lecture, we explore Elastic Potential Energy and the Force–Extension Graph, two extremely important concepts from Class 11 Physics – Deformation of Solids (NBF Board).
This video explains how energy is stored in an elastic body, how stretching and compression relate to work done, and how the area under the force–extension graph represents elastic potential energy.

This lecture is designed to provide complete conceptual clarity, exam preparation, and a deep understanding of the physics behind elastic behavior.

📌 What You Will Learn in This Video
► What is Elastic Potential Energy?

You will learn how a body stores energy when deformed within its elastic limit.
Elastic bodies such as springs store energy when stretched or compressed, and this energy is recoverable.

► Work Done in Stretching a Spring

A step-by-step explanation of how variable force does work when the extension increases gradually.
Why the average force is taken as (1/2 F)?
Why the graph forms a triangle?
All concepts are explained clearly.

► Formula for Elastic Potential Energy

Derivation and explanation of the famous formula:

𝑈=12𝑘𝑥/2

You will understand the meaning of each term, and how the spring constant relates to stiffness.

► Force–Extension Graph (F–x Graph)

Complete graphical explanation:

Force on y-axis

Extension on x-axis

Straight-line graph showing proportionality

The area under the line = Elastic Potential Energy

You will learn why the graph is linear for elastic materials and how it follows Hooke’s Law.

► Hooke’s Law and the Spring Constant

Reinforcement of the relationship:
𝐹=𝑘𝑥

How k determines the stiffness of the material, and how it affects energy storage.

► Energy Stored in Elastic Materials

Real-life applications of elastic potential energy:
✔ Springs in vehicles
✔ Bows in archery
✔ Rubber bands
✔ Trampolines
✔ Medical devices
✔ Mechanical clocks

► Elastic Limit and Recoverable Energy

Why energy is only recoverable within the elastic region
What happens if the material crosses its elastic limit
How the graph changes beyond proportional region

🎥 About This Lecture — By Danish Majeed

This lecture covers Elastic Potential Energy & Force–Extension Graph according to the NBF Class 11 Physics syllabus.
Explained in a conceptual, graphical, and exam-focused manner, this video ensures students fully understand energy storage in elastic bodies and the significance of the F–x graph.

📚 Chapter Name:

Deformation of Solids – Class 11 Physics (NBF Board)

⭐ Why This Video Is Important for Exams

✔ Complete conceptual explanation
✔ Graph-based understanding
✔ Derivation of formula
✔ Numerical problem support
✔ Board exam preparation
✔ Real-life applications

#ElasticPotentialEnergy
#ForceExtensionGraph
#HookesLaw
#WorkDoneOnSpring
#SpringConstant
#ElasticityPhysics
#DeformationOfSolids
#Class11Physics
#NBFPhysics
#PhysicsLecture
#PhysicsByDanishMajeed
#FirstYearPhysics
#PhysicsGraph
#EnergyInSprings
#MechanicalEnergy
#PhysicsConcepts
#EngineeringPhysics
#ElasticEnergyFormula
#PhysicsWithDanish