# Ch 8: Understanding Work, Energy & Power

### About This Chapter

## Understanding Work, Energy & Power - Chapter Summary

If you need to improve your understanding of energy, work and power in physics, simply follow this series of engaging physics lessons. The chapter examines the characteristics of these three concepts as well as related theorems and terminology. To help your solidify your understanding of the material, we've included short quizzes that follow each lesson. You can study the chapter at your own pace and use any Internet-connected device to access the lessons. Reviewing this chapter can help you:

- Explain why energy is significant in nature
- Evaluate the characteristics of work
- Contextualize variable forces in relation to work
- Assess the relationship between kinetic and potential energy
- Understand the work-energy theorem
- Define power

### 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.

### 2. 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.

### 3. 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.

### 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. Gravitational Potential Energy: Definition, Formula & Examples

In this lesson, you will learn what gravitational potential is, the equation we use to calculate it, and how to use that equation. We'll look at some real-life examples so you can see how it works. A short quiz will follow.

### 6. 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.

### 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. Practice Applying Energy Formulas to Systems

There is a conservation law with energy that tells us that energy can't be created or destroyed. In this lesson, we will apply this general concept to a physics system involving kinetic, gravitational, and spring energies.

### 9. 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.

### 10. Practice Applying Power Formulas in Physics

Power is how fast energy is used. There are two ways to calculate power. In this lesson, we will go through the two equations for power and explain how they can be applied to physics scenarios.

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### Other Chapters

Other chapters within the Physics 111: Physics I course

- Math Basics for Physics
- The Scientific Model
- Using Vectors in Physics
- Displacement, Velocity & Acceleration
- Understanding Kinematics in Physics
- Basics of Newton's Laws of Motion
- Newton's Law of Gravitation
- Linear Momentum
- Overview of Rotational Motion
- Overview of Oscillations in Physics
- Overview of Waves in Physics
- Overview of Sound in Physics
- Overview of Light in Physics
- Overview of Fluids in Physics
- Studying for Physics 111