Elastic Potential Energy | Work and Energy | Grade 11 | Physics | Khan Academy

Описание: In this video, learn everything about Elastic Potential Energy and Elastic Energy Density in a super simple way! 🎯
We start by understanding why force is needed to stretch a wire, derive the formula for elastic potential energy, and explain how it connects with stress, strain, and Young’s modulus.

Perfect for students preparing for physics exams or anyone curious about the behavior of elastic materials like wires, springs, and rubber bands! 🧠✨

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0:00 – Introduction: What is Elastic Potential Energy?

0:05 – Why Force is Needed to Stretch a Wire

0:39 – How Work Done is Stored as Potential Energy

0:59 – Setup: Stretching a Wire (Length Increases by ΔL)

1:28 – Calculating Average Internal Force

1:47 – Work Done = Average Force × Displacement

2:00 – Expression for Work Done: ½ × Force × ΔL

2:18 – Dividing and Multiplying by Area × Length (Why and How)

2:54 – Final Formula for Stored Elastic Potential Energy

3:17 – Introduction to Elastic Energy Density

3:36 – Deriving the Formula for Elastic Energy Density

4:00 – Relation Between Stress, Strain, and Young’s Modulus

4:23 – Final Expression for Elastic Energy Density

4:29 – Summary of Elastic Potential Energy and Energy Density

4:44 – Conclusion and Goodbye

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Created by Chandan Ganotra