# Ch 5: Work and Energy in Physics: Help and Review

### About This Chapter

## Who's It For?

Anyone who needs help learning or mastering material on work and energy in physics will benefit from the lessons in this chapter. There is no faster or easier way to learn about work and energy. Among those who would benefit are:

- Students who have fallen behind in understanding the characteristics of work or types of energy
- Students who struggle with learning disabilities or learning differences, including autism and ADHD
- Students who prefer multiple ways of learning science (visual or auditory)
- Students who have missed class time and need to catch up
- Students who need an efficient way to learn about work and energy
- Students who struggle to understand their teachers
- Students who attend schools without extra science learning resources

## How It Works

- Find videos in our course that cover what you need to learn or review.
- Press play and watch the video lesson.
- Refer to the video transcripts to reinforce your learning.
- Test your understanding of each lesson with short quizzes.
- Verify you're ready by completing the Work and Energy in Physics chapter exam.

## Why It Works

**Study Efficiently:**Skip what you know, review what you don't.**Retain What You Learn:**Engaging animations and real-life examples make topics easy to grasp.**Be Ready on Test Day:**Use the Work and Energy in Physics chapter exam to be prepared.**Get Extra Support:**Ask our subject-matter experts any question on work and energy in physics. They're here to help!**Study With Flexibility:**Watch videos on any web-ready device.

## Students Will Review

This chapter helps students review the concepts in a work and energy unit of a standard introductory physics course. Topics covered include:

- The role of energy in nature
- Examples and characteristics of work
- How to calculate work done by a variable force
- The work-energy theorem
- Types of energy
- The relationship between kinetic and potential energy
- Gravitational potential energy and elastic potential energy
- Mechanical energy conservation
- Effects of conservative and non-conservative forces
- Power

### 1. 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.

### 2. 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.

### 3. 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.

### 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.

### 5. 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.

### 6. 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.

### 7. 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.

### 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. 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.

### 10. 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.

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### Other Chapters

Other chapters within the Physics 101: Help and Review course

- Introductory Physics: Help and Review
- Vectors: Help and Review
- Kinematics: Help and Review
- Laws of Motion: Help and Review
- Linear Momentum: Help and Review
- Equilibrium and Elasticity: Help and Review
- Sound and Light: Help and Review
- Fluids in Physics: Help and Review
- Laws of Thermodynamics: Help and Review
- Electrostatics: Help and Review
- Circuits in Physics: Help and Review
- The Physics of Magnetism: Help and Review
- Wave Optics: Help and Review
- Classical Relativity: Help and Review
- Modern Physics: Help and Review
- Using Physics Formulas