Class 11 Physics — Chapter 5: WORK, ENERGY AND POWER

What you'll learn

• ▸Scalar Product of Vectors
• ▸Work Done by a Constant Force
• ▸Kinetic Energy
• ▸Work-Energy Theorem
• ▸Work Done by a Variable Force
• ▸Potential Energy and Conservative Forces
• ▸Conservation of Mechanical Energy
• ▸Potential Energy of a Spring
• ▸Power
• ▸Collisions

Chapter Summary

--- PAGE 1 --- CHAPTER FIVE WORK, ENERGY AND POWER 5.1 Introduction 5.2 Notions of work and kinetic energy : The work-energy theorem 5.3 Work 5.4 Kinetic energy 5.5 Work done by a variable force 5.6 The work-energy theorem for a variable force 5.7 The concept of potential energy 5.8 The conservation of mechanical energy 5.9 The potential energy of a spring 5.10 Power 5.11 Collisions Summary Points to ponder Exercises 5.1 INTRODUCTION The terms ‘work’, ‘energy’ and ‘power’ are frequently used in everyday language. A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Somebody who has the capacity to work for 14-16 hours a day is said to have a large stamina or energy. We admire a long distance runner for her stamina or energy. Energ…

Practice Questions from this Chapter

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1. Illustrate work with everyday examples? Get Solution →
2. Unpack different types of energy? Get Solution →
3. Calculate power from work and time? Get Solution →
4. In physics, what is the term 'energy' defined as? Get Solution →
5. The scalar product of two vectors A and B is also known as the: Get Solution →
6. What is the formula for the scalar product of two vectors A and B with an angle θ between them? Get Solution →
7. The quantity 'half the mass times the square of the speed' is called: Get Solution →
8. According to the work-energy theorem, the change in kinetic energy of a particle is equal to what? Get Solution →

Did you know?

• 💡 In physics, exerting force without movement means no work is done.
• 💡 A single lightning bolt can contain enough energy to power a home for over a month.
• 💡 Your brain consumes about 20% of your body's energy, even when you are just resting.
• 💡 The average human heart generates enough power to lift a one-ton car one foot high daily.
• 💡 Ancient Egyptians used simple machines like ramps and levers to do monumental work.

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