About This Chapter
How It Works:
- Identify the lessons in Prentice Hall Physical Science's Work, Power, and Machines chapter with which you need help.
- Find the corresponding video lessons within this companion course chapter.
- Watch fun videos that cover the topics on work, power, and machines that you need to learn or review.
- Complete the quizzes to test your understanding.
- If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.
Students will learn:
- Characteristics and examples of work
- Variable forces and work
- Work-energy theorem
- Formula for calculating power
- Types of simple machines and their functions
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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. 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. 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.
5. 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.
6. What Are Simple Machines? - Definition, Types & Examples
If you need to move or lift a heavy object, it would be wise to use a simple machine. Though these devices are far from fancy or high-tech, they are extremely helpful for getting work done.
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Other chapters within the Prentice Hall Physical Science: Online Textbook Help course
- Chapter 1: Science Skills
- Chapter 2: Properties of Matter
- Chapter 3: States of Matter
- Chapter 4: Atomic Structure
- Chapter 5: The Periodic Table
- Chapter 6: Chemical Bonds
- Chapter 7: Chemical Reactions
- Chapter 8: Solutions, Acids, and Bases
- Chapter 9: Carbon Chemistry
- Chapter 10: Nuclear Chemistry
- Chapter 11: Motion
- Chapter 12: Forces and Motion
- Chapter 13: Forces in Fluids
- Chapter 15: Energy
- Chapter 16: Thermal Energy and Heat
- Chapter 17: Mechanical Waves and Sound
- Chapter 18: The Electromagnetic Spectrum and Light
- Chapter 19: Optics
- Chapter 20: Electricity
- Chapter 21: Magnetism