# Ch 9: Energy and Work in Physics

### About This Chapter

## Energy and Work in Physics - Chapter Summary

Work through this chapter at your own pace to study the applications of energy and work in physics. Inside, you'll find short and simple lessons that break down the fundamentals of work, energy, simple machines, energy types and much more. To help you reinforce your understanding of these concepts, we've included multiple-choice lesson quizzes and a chapter exam. These lessons are available to study at any time of day or night, and our instructors are happy to answer any questions you may have about energy and work. Studying this chapter can help you:

- Define the characteristics of work and the mathematics of power
- Explain the significance of energy in nature
- Assess the application of the work-energy theorem
- Identify the parts of simple machines
- Recognize examples of kinetic energy
- Compare gravitational and elastic potential energy
- Describe the relationship between kinetic and potential energy
- Apply work and kinetic energy formulas
- Understand the conservation of mechanical energy

### 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. 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. Simple Machines: Lever, Inclined Plane & Pulley

Discover what a simple machine is and how it operates. Then learn about the mechanical advantages various simple machines such as levers, inclined planes and pulleys give us.

### 5. 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.

### 6. 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.

### 7. 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.

### 8. 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.

### 9. Practice Applying Work & Kinetic Energy Formulas

In this lesson, you're going to learn about practical applications of work and kinetic energy formulas. Specifically, we'll look at how these formulas can be applied to moving an object across a surface and lifting weights.

### 10. 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.

### 11. 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: Intro to Physics course

- Intro to Physics
- Overview of Vectors
- Overview of Kinematics
- Overview of Forces
- Overview of Gravity
- Basics of Newton's First Law
- Basics of Newton's Second Law
- Basics of Newton's Third Law
- Overview of Linear Momentum in Physics
- Basics of Rotational Motion
- Waves in Physics
- Sound & Light in Physics
- Basics of Optics
- Fluid Dynamics in Physics
- Basics of Thermodynamics in Physics
- Overview of Electrostatics
- Overview of Magnetism
- Basics of Nuclear Physics
- Studying for Physics 101