Ch 5: Work & Energy Theorems in Physics

About This Chapter

Increase your understanding of work and energy as they're used and described in the study of physics with this chapter. Use these quick video lessons and quizzes as a comprehensive study guide to help you prepare for an upcoming exam or tough homework assignment.

Work & Energy Theorems in Physics - Chapter Summary

In this chapter, you will review how work is done by variable force and how to calculate it. The relationship, differences and similarities between potential energy and kinetic energy will be introduced. The work-energy theorem and how it applies in physics will also be discussed.

As you move on through the lessons, you'll learn how power is defined in physics as well as the concepts of conservative force and the conservation of mechanical energy. Once you have completed this chapter, you should be able to:

  • Calculate variable force
  • Describe the relationship between kinetic and potential energy
  • Explain how work and energy function together in physics
  • Differentiate between work and power
  • Give examples of conservative forces
  • Detail how mechanical energy is transferred between objects

Either before or after you watch the video lessons, take the quizzes and chapter test to ascertain where you should focus your study. Use the video tabs feature in the Timeline to skip to specific parts of the video that you would like to watch. Transcripts of these lessons can be printed and used as learning tools for offline review. At any time, these study materials can be accessed on any computer, mobile phone or tablet.

6 Lessons in Chapter 5: Work & Energy Theorems in Physics
Test your knowledge with a 30-question chapter practice test
Work Done by a Variable Force

1. 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.

Kinetic Energy to Potential Energy: Relationship in Different Energy Types

2. Kinetic Energy to Potential Energy: Relationship in Different Energy Types

This video defines and describes kinetic and potential energy. You'll learn how different types of energy can be classified as potential and kinetic. You'll also find out how kinetic and potential energy are transformed.

Work-Energy Theorem: Definition and Application

3. 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.

Power: Definition and Mathematics

4. 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.

Conservative Forces: Examples & Effects

5. Conservative Forces: Examples & Effects

Learn how to tell if a force is conservative and what exactly is being conserved. Then look at a couple of specific examples of forces to see how they are conservative.

Conservation of Mechanical Energy

6. 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.

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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