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Ch 8: Holt Physical Science Chapter 8: Work and Machines

About This Chapter

The Work and Machines chapter of this Holt Physical Science Textbook Companion Course helps students learn essential physical science lessons on work and machines. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the work and machines textbook chapter.

How it works:

  • Identify the lessons in the Holt Physical Science Work and Machines chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the work and machines topics 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 of work
  • Mathematical determination of power
  • Types of simple machines
  • Mechanical advantage
  • Pulleys and inclined planes
  • Efficiency of compound machines

Holt is a registered trademark of Holt, Rinehart and Winston, which is not affiliated with Study.com.

7 Lessons in Chapter 8: Holt Physical Science Chapter 8: Work and Machines
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.

Power: Definition and Mathematics

2. 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.

Mechanical Advantage: Definition, Calculations & Equations

3. Mechanical Advantage: Definition, Calculations & Equations

If you need to move a heavy object, a simple machine can be used to make your job easier. Learn how simple machines, like levers and pulleys, can be used to gain a mechanical advantage. See mechanical advantage equations and calculations.

What Are Simple Machines? - Definition, Types & Examples

4. 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.

Pulleys: Basic Mechanics

5. 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.

Inclined Planes in Physics: Definition, Facts, and Examples

6. Inclined Planes in Physics: Definition, Facts, and Examples

If an object is not horizontal to the ground, it may be on an inclined plane. We need to adjust both the calculations and the free-body diagram when determining the net force on an object on an inclined plane. Learn how in this lesson.

Understanding the Efficiency of Compound Machines

7. Understanding the Efficiency of Compound Machines

Compound machines are made up of two or more simple machines. When you combine simple machines, you increase the mechanical advantage, but might have to sacrifice some efficiency. Learn about compound machines and see examples.

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