About This Chapter
Work, Energy and Power - Chapter Summary
Whether you need some clarification on the differences between work, energy and power or would like to get some extra practice with calculations involving these variables, this chapter is for you. Introductory lessons define work and show you how to calculate the work done by both variable and constant forces. You'll also study the significance of energy in nature and explore the relationship between the amount of work done and the change in an object's kinetic energy. If you're interested in reviewing mechanical energy concepts, we also have lessons to help you study the forces at work in pulleys and the steps involved in calculating power. Topics of instruction include:
- Characteristics of work
- The work-energy theorem
- Mechanical energy
- Pulley mechanics
This chapter includes plenty of resources to help you master the relationship between work, energy and power. Watch the entertaining video lessons or read the transcripts to get a thorough review of important concepts. You can also follow links embedded in the transcripts to refresh your memory of key physics terminology or take the multiple-choice quizzes to see how much you've learned.
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. 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.
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.
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. 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.
6. 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.
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. 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 within the College Physics: Help & Review course
- Scientific Inquiry
- Formulating Scientific Questions
- Planning a Scientific Investigation
- Observation and Data Collection
- Data Analysis and Graphing
- Drawing and Explaining Conclusions
- Safety During Science Experiments
- Scientific Ethics
- Motion and Newton's Laws
- Kinematic Equations in Physics
- Properties of Rotational Motion
- Linear Momentum Principles
- Heat and Thermodynamics
- Characteristics of Waves
- Electrical & Magnetic Forces
- Electric Potential & Capacitance
- Physics Circuits
- Magnetic Forces and Fields
- Quantum Mechanics and the Standard Model
- Science Literacy
- Diversity in Science
- Historical Perspectives in Physics
- Science, Technology and Beliefs