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Ch 14: Work, Energy and Power

About This Chapter

Review the characteristics of work and the work-energy theorem with this collection of video lessons. We'll also help you take a closer look at mechanical energy and the formula for power.

Work, Energy and Power - Chapter Summary

Whether you need some clarification on the differences between work, energy and power or would like to get some extra practice with calculations involving these variables, this chapter is for you. Introductory lessons define work and show you how to calculate the work done by both variable and constant forces. You'll also study the significance of energy in nature and explore the relationship between the amount of work done and the change in an object's kinetic energy. If you're interested in reviewing mechanical energy concepts, we also have lessons to help you study the forces at work in pulleys and the steps involved in calculating power. Topics of instruction include:

  • Characteristics of work
  • The work-energy theorem
  • Mechanical energy
  • Pulley mechanics
  • Power

This chapter includes plenty of resources to help you master the relationship between work, energy and power. Watch the entertaining video lessons or read the transcripts to get a thorough review of important concepts. You can also follow links embedded in the transcripts to refresh your memory of key physics terminology or take the multiple-choice quizzes to see how much you've learned.

8 Lessons in Chapter 14: Work, Energy and Power
Test your knowledge with a 30-question chapter practice test
Work: Definition, Characteristics, and Examples

1. Work: Definition, Characteristics, and Examples

Pushing a wall all day may feel like work, but unless you get that wall moving you're not doing any work according to the rules of physics. In this video lesson, you'll learn how work is defined as well as how to calculate the amount of work done on an object.

Work Done by a Variable Force

2. Work Done by a Variable Force

Doing work on an object is a simple concept: we apply a certain force over a certain distance. But in real life, that force is rarely constant. Therefore, we need to understand variable forces and be able to calculate them accurately.

What is Energy? - Definition and Significance in Nature

3. What is Energy? - Definition and Significance in Nature

This lesson describes the nature of energy and how it is transferred from one source into another. Additionally, it will describe the significance of energy in natural systems.

Work-Energy Theorem: Definition and Application

4. Work-Energy Theorem: Definition and Application

Work and energy are closely related in physics. In this lesson, you'll learn what that relationship is as well as how we can apply it to various situations.

What is Mechanical Energy? - Definition & Examples

5. What is Mechanical Energy? - Definition & Examples

In physics, energy is how work gets done. This video describes one important type of energy, mechanical energy, and provides examples of both kinetic and potential mechanical energy.

Pulleys: Basic Mechanics

6. Pulleys: Basic Mechanics

Like other simple machines, pulleys can help us lift and move heavy loads with less effort. In this video lesson, you'll learn how pulleys do this as well as how this is possible while still obeying the law of conservation of energy.

Conservation of Mechanical Energy

7. Conservation of Mechanical Energy

Energy comes in many forms and for any system can never be created or destroyed. This holds true for mechanical energy, which also obeys this law of conservation of energy. In this video lesson, you'll explore how mechanical energy is converted or transferred between forms and objects.

Power: Definition and Mathematics

8. Power: Definition and Mathematics

Work involves moving an object with a force, but power tells us how quickly that work is done. In this lesson, you will learn about how power depends on both work and time as well as see examples of how to calculate power.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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