Physics · Class 11 · Chapter 5
Work, Energy and Power
10 lessons 94 min 4 simulations 9 practice questions
This chapter gives an energy-based way to solve mechanics problems. Using the scalar product, it defines work, links work to kinetic energy through the work-energy theorem, introduces potential energy for conservative forces (gravity and springs), states when mechanical energy is conserved, defines power, and applies momentum and energy ideas to collisions.
What the exam asks
NEET asks direct numericals on work by an inclined force, the work-energy theorem with friction, spring compression, pump or motor power with efficiency, and one-dimensional elastic and inelastic collisions, along with statement questions on conservative forces. Marks are lost by dropping the cos θ factor, ignoring the work done by friction, mixing up momentum and kinetic-energy ratios, and assuming each body keeps its kinetic energy in an elastic collision.
Lessons
10 lessons · 94 min
1The scalar productNCERT § "The Scalar Product"6 min2WorkNCERT § "Work"11 min 1 sim3Kinetic energy and the work-energy theoremNCERT § "Notions of Work and Kinetic Energy: The Work-Energy Theorem"7 min4Work done by a variable forceNCERT § "Work Done by a Variable Force"6 min5Potential energy and conservative forcesNCERT § "The Concept of Potential Energy"7 min6Conservation of mechanical energyNCERT § "The Conservation of Mechanical Energy"11 min 1 sim7Potential energy of a springNCERT § "The Potential Energy of a Spring"10 min 1 sim8PowerNCERT § "Power"7 min9CollisionsNCERT § "Collisions"12 min 1 sim10Chapter reviewMust-know facts, traps and formulas17 min