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Ch 5: Work, Energy, & Power in Physics

About This Chapter

Watch online video lessons to learn about kinetic and potential energy, mechanical energy, variable force, and more. Each lesson is accompanied by a short multiple-choice quiz you can use to check your understanding of these physics topics.

Work, Energy, & Power - Chapter Summary and Learning Objectives

This chapter's instructors provide you with real-life examples of the forces at play when energy is expended to move an object. Let them familiarize you with the two basic forms of energy, as well as how they can both be used to perform work. This chapter is designed to teach you the following:

  • Definition of work
  • Difference between potential and kinetic energy
  • Characteristics of mechanical energy
  • Steps for calculating power

Video Objective
Work: Definition, Characteristics, and Examples Defines work and discusses the characteristics of work, including force, displacement, and cause.
Work Done by a Variable Force Describes the process of determining work done by a variable force.
What is Energy? - Definition and Significance in Nature Explains how energy is used to perform work and explores the necessity of energy as fuel.
Kinetic Energy to Potential Energy: Relationship in Different Energy Types Illustrates the differences between an object's stored energy and the energy resulting from its motion.
Work-Energy Theorem Applies the theorem explaining the relationship between the work done on an object and its kinetic energy.
What is Mechanical Energy? - Definition & Examples Describes the energy resulting from an object's position or motion and identifies examples in nature.
Conservation of Mechanical Energy Analyzes situations in which kinetic energy becomes converted into potential energy and back again.
Power: Definition and Mathematics Discusses the process of calculating units of power by determining variables for time and the amount of energy consumed.

9 Lessons in Chapter 5: Work, Energy, & Power in Physics
Work: Definition, Characteristics, and Examples

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.

Work Done by a Variable Force

2. 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.

What is Energy? - Definition and Significance in Nature

3. 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.

Kinetic Energy to Potential Energy: Relationship in Different Energy Types

4. 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.

Work-Energy Theorem: Definition and Application

5. 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.

What is Mechanical Energy? - Definition & Examples

6. 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.

Pulleys: Basic Mechanics

7. Pulleys: Basic Mechanics

Like other simple machines, pulleys can help us lift and move heavy loads with less effort. In this video lesson, you'll learn how pulleys do this as well as how this is possible while still obeying the law of conservation of energy.

Conservation of Mechanical Energy

8. 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.

Power: Definition and Mathematics

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.

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