# Ch 15: AP Physics 2: Conservation Principles

### About This Chapter

## AP Physics 2: Conservation Principles - Chapter Summary

These engaging lessons cover conservation principles in physics, including the internal energy of a system and the definitions of power and work as they're explained in physics. Professional instructors have created these informative lessons, so you can feel confident that you're learning all you need to know about these topics. If you need to go back and review just one part of a video lesson or skip ahead to a section you want to review, use the video tags found in the Timeline. As you move through the lessons, feel free to contact an instructor if you need help. This chapter is designed to help you do the following on the AP Physics 2:

- Use the object model to calculate the expected behavior of a system
- Calculate changes in the potential and kinetic energy of a system
- Define the characteristics of work and power
- Understand the application of the work-energy theorem
- Describe work done by a variable force
- Give an example of a pressure-volume diagram
- Plot volume and pressure as they're found in the thermodynamic process
- Define the atomic spectrum
- Explain the spectra associated with nuclear or electronic transitions
- Apply the conservation of energy and mass to a natural phenomenon

### 1. Internal Energy of a System: Definition & Measurement

We often talk about individual types of energy, but how do you measure total energy? One way is to find the internal energy of a system. Let's learn what it means and how it is measured.

### 2. Calculating Changes in Kinetic & Potential Energy of a System

A system of interacting objects can have both kinetic and potential energy. As potential energy changes, this can change the kinetic energy of the system, too. In this lesson, learn about these important types of energy and how they can change.

### 3. 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.

### 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. 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.

### 6. 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.

### 7. Pressure-Volume Diagram: Definition & Example

Pressure and volume are two variables that relate to a parcel of gas. This lesson explores how work done on a parcel of gas in a cylinder changes its pressure and volume.

### 8. Plotting Pressure vs. Volume for a Thermodynamic Process

Pressure and volume are measured in order to determine work done in some systems. In this lesson we will learn how to plot pressure and volume and what we can calculate from the plot.

### 9. Atomic Spectrum: Definition, Absorption & Emission

In this lesson, we'll discuss the meaning of the term 'atomic spectrum' and distinguish between the two main types of atomic spectra: absorption and emission spectra. We'll also describe how each forms.

### 10. Applying Conservation of Mass & Energy to a Natural Phenomenon

Einstein derived an equation that relates mass to energy. In this lesson, we will investigate what this equation means and we will go through a few examples using it.

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### Other Chapters

Other chapters within the AP Physics 2: Exam Prep course

- AP Physics 2: Properties & Structure of Systems
- AP Physics 2: Fluids & Fluid Flow
- AP Physics 2: Electric Charge
- AP Physics 2: Mass & Energy
- AP Physics 2: Properties of Objects, Space & Time
- AP Physics 2: Properties of Matter
- AP Physics 2: Vector & Scalar Fields
- AP Physics 2: Electric Fields
- AP Physics 2: Magnetic Fields
- AP Physics 2: Forces
- AP Physics 2: Newton's Laws of Motion
- AP Physics 2: Force Labs
- AP Physics 2: Electric & Magnetic Properties of a System
- AP Physics 2: Thermodynamics & Entropy
- AP Physics 2: Conservation in Electrical Circuits
- AP Physics 2: Conservation of Electric Charge
- AP Physics 2: Conservation of Nucleon Number
- AP Physics 2: Conservation of Linear Momentum
- AP Physics 2: Waves
- AP Physics 2: Reflection & Refraction
- AP Physics 2: Electromagnetic Radiation
- AP Physics 2: Wave Models
- AP Physics 2: Ideal Gas
- AP Physics 2 Flashcards