# Ch 5: Work and Energy in Physics

### About This Chapter

## Work and Energy in Physics - Chapter Summary and Learning Objectives

Understand the importance of energy in nature in this chapter, which introduces you to the work characteristics of force and displacement and the relationship between work and energy. You'll see how kinetic energy and potential energy are connected and learn about the effects of conservative and non-conservative forces. When you've watched the lessons in this chapter, you'll be familiar with:

- Characteristics of work
- Work-energy theorem
- Equation for elastic potential energy
- Examples of gravitational potential energy
- Math used for power

Video | Objectives |
---|---|

What is Energy? - Definition and Significance in Nature | Learn where energy comes from and why it's necessary. Explore some types of energy. |

Work: Definition, Characteristics, and Examples | Define work and calculate amount of work done. Identify some characteristics of work, such as force, cause and displacement. |

Work Done by a Variable Force | Describe the process of determining work by a variable force. |

Work-Energy Theorem: Definition and Application | Analyze the relationship between work and energy and apply the theorem to different situations. |

Kinetic Energy to Potential Energy: Relationship in Different Energy Types | Find out how different types of energy are classified as potential or kinetic and explain the relationship between these two classifications. |

Understanding Gravitational Potential Energy | Define this concept and see examples of this form of energy. |

Elastic Potential Energy: Definition, Formula & Examples | Define this concept and introduce the equation for elastic potential energy. Demonstrate how to apply the concept. |

Conservative Forces: Examples & Effects | Explain the effect of a conservative force on the mechanical energy of a system. |

Non-Conservative Forces: Examples & Effects | Describe how mechanical energy is affected by a non-conservative force and see examples of non-conservative forces. |

Conservation of Mechanical Energy | Analyze situations in which mechanical energy is conserved. |

Power: Definition and Mathematics | Learn how to calculate power and explain how it's dependent on work and time. |

### 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. 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. 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.

### 9. 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.

### 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 UExcel Physics: Study Guide & Test Prep course

- Introduction to Physics
- Vectors
- Kinematics
- Force and the Laws of Motion
- Linear Momentum in Physics
- Rotational Motion
- Equilibrium and Elasticity
- Waves, Sound, and Light
- Fluids in Physics
- Thermodynamics in Physics
- Electrostatics
- Circuits in Physics
- The Physics of Magnetism
- Wave Optics
- Relativity
- Modern Physics & Nuclear Physics
- UExcel Physics Flashcards