About This Chapter
Understanding Work, Energy and Power - Chapter Summary
Expert instructors have developed fun lessons designed to make your study of work, energy and power fun and easy. View entertaining lessons via your computer, smartphone or tablet to enhance your comprehension of topics that include kinetic energy, variable force and mechanical energy. By the end of this chapter, you will be ready to do the following:
- Define work, and discuss work by variable force
- Share the definitions of kinetic energy and the work-energy theorem
- Explain the meaning of potential energy and elastic potential energy
- List the effects of conservative forces
- Detail how mechanical energy converts or transfers between forms and objects
- Discuss the effects of nonconservative forces
- Describe the motion of objects moving in vertical circles
- Differentiate between elastic and inelastic collisions
Resources in this chapter are easy to navigate. Choose any lesson to review based on your current and desired knowledge of work, energy and power, and select others in any sequence to continue your study of this subject. Click the Quiz tab with any lesson to assess your comprehension of the concepts it covers. Use the Ask Our Experts feature in the Dashboard to send any lesson topic questions to our experts. Ensure you understand the entire chapter by taking the practice exam.
1. Overview of Work & Work by Variable Force
After completing this lesson, you will be able to explain what work is, and how to calculate work using the equation, and a force-distance graph. A short quiz will follow.
2. Kinetic Energy: Examples & Definition
To knock down a set of bowling pins, what must be true about the bowling ball? It must be moving! This lesson discusses the energy perspective of this simple truth: kinetic energy.
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.
4. What is Potential Energy? - Definition & Examples
All great educators and parents inspire us to reach our potential - to discover parts of us yet to be realized. Potential energy in science is not much different. This lesson explores the concept of energy that has the potential to do work.
5. Elastic Potential Energy: Definition, Formula & Examples
Discover what elastic potential energy is and the types of objects that can have it. Then learn how we find the formula for elastic potential energy using a spring.
6. 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.
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.
8. Nonconservative Forces: Examples & Effects
Find out what exactly it is that makes a force nonconservative. Then look at some of the most common types of nonconservative forces and how they affect the world around us.
9. Objects Moving in Vertical Circles: Analysis & Practice Problems
After watching this video, you will be able to describe motion of an object moving in a vertical circle and derive and use equations for this motion in problem solving. A short quiz will follow.
10. Elastic and Inelastic Collisions: Difference and Principles
When objects come in contact with each other, a collision occurs. In this lesson, you'll learn about the two types of collisions as well as how momentum is conserved in each.
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