About This Chapter
Physical, Earth & Space Sciences - Chapter Summary
Let us aid in your review of some basic science principles and concepts, including the characteristics of matter, types of force and the role of energy in nature. In this chapter, our instructors examine sound and light, and look at magnetic force and simple machines. After watching these lessons, you'll understand more about topics including:
- Physical and chemical properties of matter
- States of matter
- Types of force
- Definition of simple machines
- Uses of scientific tools
- Factors that influence the speed of sound
- Magnetic force, including a definition of poles and dipoles
Using examples, humor and solid knowledge of the subject, our expert instructors lead you through short lessons that are both fun and informative. You can assess your learning through the short quizzes that follow each lesson. Every video includes a Timeline with clickable links that make it quick work to locate specific parts of the lesson that you wish to re-visit.
1. Matter: Physical and Chemical Properties
How are substances identified? There are two major ways we can describe a substance: physical properties and chemical properties. Learn about how chemists use properties to classify matter as either a mixture or a pure substance.
2. States of Matter and Chemical Versus Physical Changes to Matter
The world around us is constantly changing. Chemists put those changes into two main categories: physical changes and chemical changes. This lesson will define and provide examples of each.
3. Force: Definition and Types
Force is everywhere and it comes in a variety of sizes, directions, and types. In this video lesson, you'll identify force as well the different types of force that objects may experience.
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.
5. Scientific Tools and Their Uses
A scientist relies on tools to help make observations, carry out experiments and take measurements. Learn about the scientific tools used in a lab and the advanced tools used by scientists in the life sciences.
6. What is Light?
This lesson will define and describe what light is from both technical and more common-use perspectives, discuss what the different kinds of light are, and explain why it's called radiation.
7. What is Sound? - Definition and Factors Affecting the Speed of Sound
Explore the minute workings of sound waves and how they travel. We'll discuss the main factors that affect the speed of sound waves, and we'll try some mathematical problems involving the wave equation.
8. What Is Electricity? - Definition & Concept
Learn the history of electricity, from Ben Franklin's kite experiment to laptop batteries. Explore the many different ways electricity is measured, generated, and stored.
9. Magnetic Force: Definition, Poles & Dipoles
You're probably familiar with magnets, but have you ever stopped to consider how they work? In this lesson, we'll look at the root of magnetism and some of the fundamental properties of magnets.
10. 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.
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