In this lecture, we continue our Work, Power & Energy (WPE) series for Chapter 6 of NCERT Class 11 Physics with Very Basics – 3, focusing on the Work-Energy Theorem and its applications.
This video is useful for:
CBSE Class 11 Physics students
State Boards (all PCM streams)
Competitive Exams like JEE Main, NEET (UG), CUET, and other entrance exams
We will cover important concepts, solved examples, and problem-solving strategies to strengthen your foundation.
📌 Key Concepts Covered
✅ Work (W):
Work is said to be done when a force is applied on a body and the body gets displaced in the direction of the applied force.
W = F · d = Fd cosθ
✅ Kinetic Energy (KE):
The energy possessed by a body due to its motion.
KE = 1/2 mv²
✅ Work-Energy Theorem (WET):
The net work done on a particle is equal to the change in its kinetic energy.
Wnet = ΔKE = KEfinal – KEinitial
⏱️ Timestamps
00:00 – Introduction to Work, Power & Energy Series
01:05 – Concept of Kinetic Energy & Work-Energy Theorem
04:00 – Solved Example 1: An object of mass 5 kg falls from rest through a vertical distance of 20 m and attains a velocity of 10 m/s. How much work is done by the resistance of air on the object? (Take g = 10 m/s²)
07:50 – Solved Example 2: The displacement x of a particle moving in one dimension, under the action of a constant force, is related to time t by the equation:
t = √x + 3, where x is in metre and t in second.
(a) Find the displacement of the particle when its velocity is zero.
(b) Find the work done by the force in the first 6 seconds.
11:30 – Quick Recap & Key Takeaways
Chapter 6 of NCERT Class 11 Physics – Work, Power and Energy introduces students to the fundamental concepts of how forces produce motion and energy changes. The chapter begins with the definition of work and the conditions under which work is done. It explains positive and negative work, the concept of kinetic energy (KE) and potential energy (PE), and derives the Work-Energy Theorem, which is one of the most powerful tools in mechanics. The chapter also covers conservative and non-conservative forces, the law of conservation of energy, the concept of power as the rate of doing work, and efficiency in real-life applications. This chapter lays the foundation for advanced topics in mechanics and is highly important for CBSE board exams, JEE, NEET, and CUET.
📚 Related Videos in This Series
WPE – Very Basics (1): Introduction to Work, Power & Energy
• Class 11 Physics | Work, Power & Energy : ...
WPE – Very Basics (2): Work by Conservative & Non-Conservative Forces
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WPE – Very Basics (3): Work-Energy Theorem (this video)
• Class 11 Physics | Work, Power & Energy - ...
Work power Energy (Work done by constant and variable force)
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• Class 11 Physics | Work, Power and Energy ...
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