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⚡ Work, Energy, and Power – Class 11 Physics (NCERT) This chapter from Class 11 Physics NCERT explains the basic concepts of Work , different forms of Energy , and the concept of Power . These are foundational ideas used in all branches of physics. 🧱 What is Work? Work is said to be done when a force is applied on a body and there is displacement in the direction of the force. Work (W) = F × d × cosθ F = Force d = Displacement θ = Angle between force and displacement ✅ Types of Work Positive Work → θ < 90° Negative Work → θ > 90° Zero Work → θ = 90° (e.g., circular motion) SI Unit: Joule (J) 🔋 What is Energy? Energy is the capacity to do work. It exists in various forms: mechanical, thermal, chemical, electrical, etc. 🔹 Kinetic Energy (K.E.) Energy possessed by a body due to motion. K.E. = ½mv² 🔹 Potential Energy (P.E.) Energy possessed due to position or configuration. P.E. = mgh Total Mecha...

🌍 Motion in a Plane – Class 11 Physics (NCERT) Motion in a Plane deals with movement in two dimensions, using the concepts of vectors and projectile motion . This is the second part of kinematics after motion in a straight line. 📘 Key Concepts Scalars: Quantities with magnitude only (e.g., speed, mass) Vectors: Quantities with both magnitude and direction (e.g., velocity, displacement) Vector Addition: Using triangle or parallelogram law Resolution of Vectors: Splitting a vector into components along x and y axes 🧮 Basic Vector Formulas Resultant of two vectors: R = √(A² + B² + 2ABcosθ) Component form: A = A x î + A y ĵ Magnitude: |A| = √(A x ² + A y ²) Direction: θ = tan⁻¹(A y /A x ) 🎯 Projectile Motion When an object is thrown at an angle, it follows a curved path called a projectile . It is a 2D motion with horizontal and vertical...

📘 Motion in a Straight Line – Class 11 Physics (NCERT) This topic explains motion along a straight line (also called one-dimensional motion) as per Class 11 NCERT Physics syllabus. It covers the essential concepts, formulas, and derivations required for CBSE and NEET preparation. 🔍 Key Concepts Displacement (s): Change in position with direction Velocity (v): Speed with direction (vector) Speed: Distance traveled per unit time (scalar) Acceleration (a): Rate of change of velocity Time (t): Total duration of motion 🧾 Equations of Motion (Under Constant Acceleration) The following three equations apply when acceleration is uniform: 1️⃣ First Equation v = u + at 2️⃣ Second Equation s = ut + ½at² 3️⃣ Third Equation v² = u² + 2as 📐 Derivations From definitions: Acceleration: a = (v - u)/t → v = u + at Displacement using average velocity: Average velocity = (u + v)/2 s = [(u + v)/2] × t → ...