# Ch 5: Work and Energy in Physics: Help and Review

### About This Chapter

## Who's It For?

Anyone who needs help learning or mastering material on work and energy in physics will benefit from the lessons in this chapter. There is no faster or easier way to learn about work and energy. Among those who would benefit are:

- Students who have fallen behind in understanding the characteristics of work or types of energy
- Students who struggle with learning disabilities or learning differences, including autism and ADHD
- Students who prefer multiple ways of learning science (visual or auditory)
- Students who have missed class time and need to catch up
- Students who need an efficient way to learn about work and energy
- Students who struggle to understand their teachers
- Students who attend schools without extra science learning resources

## How It Works

- Find videos in our course that cover what you need to learn or review.
- Press play and watch the video lesson.
- Refer to the video transcripts to reinforce your learning.
- Test your understanding of each lesson with short quizzes.
- Verify you're ready by completing the Work and Energy in Physics chapter exam.

## Why It Works

**Study Efficiently:**Skip what you know, review what you don't.**Retain What You Learn:**Engaging animations and real-life examples make topics easy to grasp.**Be Ready on Test Day:**Use the Work and Energy in Physics chapter exam to be prepared.**Get Extra Support:**Ask our subject-matter experts any question on work and energy in physics. They're here to help!**Study With Flexibility:**Watch videos on any web-ready device.

## Students Will Review

This chapter helps students review the concepts in a work and energy unit of a standard introductory physics course. Topics covered include:

- The role of energy in nature
- Examples and characteristics of work
- How to calculate work done by a variable force
- The work-energy theorem
- Types of energy
- The relationship between kinetic and potential energy
- Gravitational potential energy and elastic potential energy
- Mechanical energy conservation
- Effects of conservative and non-conservative forces
- Power

### 1. What is Energy? - Definition and Significance in Nature

Energy is the capacity or ability to perform work, which is significant in causing anything to move within nature. Explore the different types of energy, where it comes from, why it is necessary, and how it is important in natural systems.

### 2. Work: Definition, Characteristics, and Examples

In physics, work refers to the distance an object moves due to the force applied to it. Learn about the definition, components, and characteristics of work, and discover how to calculate the amount of work done on an object through some examples.

### 3. Work Done by a Variable Force

In physics, work is simply the amount of force needed to move an object a certain distance. In this lesson, discover how to calculate work when it is done by a variable force using rectangular approximation and integration.

### 4. Work-Energy Theorem: Definition and Application

The work-energy theorem relates the net work done of forces on an object and the change in the kinetic energy of the object. Learn about the definition and application of the work-energy theorem, explore work as a change in energy, discover how the work-energy theorem can be applied to the potential energy of an object, and understand how the increase or decrease in energy is associated with the work-energy theorem.

### 5. Kinetic Energy to Potential Energy: Relationship in Different Energy Types

Kinetic energy and potential energy are created differently. In this lesson, we will dive into different types of energy, and how they can be transformed into other types of energy.

### 6. Elastic Potential Energy: Definition, Formula & Examples

When an object can be deformed and return to its original shape, it has elastic potential energy. Discover what elastic potential energy is, learn how to find it using Hooke's Law, and use the formula to work through examples.

### 7. Conservative Forces: Examples & Effects

Energy is conserved when the forces acting on an object are only conservative forces. Learn about conservative force and its effects on the conservation of energy, and see examples of conservative forces such as force due to gravity and elastic spring force.

### 8. Nonconservative Forces: Examples & Effects

Nonconservative forces do not conserve energy within a system or that allow energy to dissipate from it. Learn how path dependence can reveal a nonconservative force, and also about the most common type of nonconservative forces, which are frictional forces, such as static friction, for example.

### 9. Conservation of Mechanical Energy

In physics, mechanical energy refers to the power that an object obtains based on its position or movement. Learn about the conservation of mechanical energy, including kinetic and potential mechanical energy. Explore how energy is conserved in a system, review conservation in action, and recognize outside forces on the system.

### 10. Power: Definition and Mathematics

Power in mathematics refers to how much work can be done in a certain amount of time, meaning the more work that can be done in the same amount of time means more power. Study the definition of power in mathematics and how it is calculated.

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### Other Chapters

Other chapters within the Physics 101: Help and Review course

- Introductory Physics: Help and Review
- Vectors: Help and Review
- Kinematics: Help and Review
- Laws of Motion: Help and Review
- Linear Momentum: Help and Review
- Equilibrium and Elasticity: Help and Review
- Sound and Light: Help and Review
- Fluids in Physics: Help and Review
- Laws of Thermodynamics: Help and Review
- Electrostatics: Help and Review
- Circuits in Physics: Help and Review
- The Physics of Magnetism: Help and Review
- Wave Optics: Help and Review
- Classical Relativity: Help and Review
- Modern Physics: Help and Review
- Using Physics Formulas