Ch 7: Essential Concepts in Physics

About This Chapter

16 Lessons in Chapter 7: Essential Concepts in Physics
Test your knowledge with a 30-question chapter practice test
Law of Conservation of Matter: Definition & Matter

1. Law of Conservation of Matter: Definition & Matter

In this lesson, we'll learn the definition of the Law of Conservation of Mass, sometimes called the Conservation of Matter. This lesson explores the discovery of this important principle and covers a few examples of how it works.

Length Contraction Explained: Formula & Example

2. Length Contraction Explained: Formula & Example

Learn what length contraction has to do with the speed of light, and why we don't notice it in every day life. Also learn a little about other relativity topics that will help you understand length contraction better.

Laws of Inertia: Definition & Formula

3. Laws of Inertia: Definition & Formula

Inertia is the tendency of an object to stay at rest or in motion. Learn more about Newton's first law as it explains how forces acting on an object are related to the object's mass and motion through several examples, and test your knowledge with quiz questions.

Scalar Quantity in Physics: Definition & Examples

4. Scalar Quantity in Physics: Definition & Examples

In this lesson, you will learn about what makes a number a scalar quantity. You will learn how to identify quantities that are scalars from those that are not scalar quantities. You will also learn about numbers that don't look like scalars but are actually scalars.

Vertical Velocity: Definition & Equation

5. Vertical Velocity: Definition & Equation

In this lesson we will look at vertical velocity and why it is very different from horizontal velocity. You will learn the equation used to calculate vertical velocity and learn to apply it to a few situations.

What is a Newton? - Units & Explanation

6. What is a Newton? - Units & Explanation

A newton is a unit of measurement named after Sir Isaac Newton. It measures force and has units of kilogram meter per second squared. This lesson will describe the newton.

What is Net Force? - Definition, Magnitude & Equations

7. What is Net Force? - Definition, Magnitude & Equations

In this lesson, we will define net force, and explore the magnitude of a net force, the relevant equations and examples that will help make the concept of net force clearer.

What is Terminal Velocity? - Definition, Formula, Calculation & Examples

8. What is Terminal Velocity? - Definition, Formula, Calculation & Examples

In this lesson, we will learn about terminal velocity and why it is better to jump out of a plane with a parachute than without one. We will explore why objects fall at different speeds and how to calculate the maximum speed of a falling object.

What is the Formula for Force? - Definition & Explanation

9. What is the Formula for Force? - Definition & Explanation

In this lesson, we'll explain what forces are in science. We'll review how to construct free body diagrams and calculate net force in order to use the force equation to solve for force, mass, and acceleration.

What is Physics? - Definition, Branches, Fundamentals & Topics

10. What is Physics? - Definition, Branches, Fundamentals & Topics

Get a basic overview of modern physics. Learn about the science's origins, the fields of physics being worked in today, and the major subject areas taught in general physics courses.

Molality: Definition & Formula

11. Molality: Definition & Formula

In chemistry, knowing the concentration of a solution is very important. There are different ways to express the amount of concentration, and one of these is by calculating the molality. In this lesson, we discuss molality.

Nanometers: Definition & Symbol

12. Nanometers: Definition & Symbol

Discover what exactly is meant by the term 'nano'. Then learn exactly how small nanometer-sized objects are and some examples of what exists at that size scale, both naturally and artificially created.

Natural Laws of Science: Definition & Examples

13. Natural Laws of Science: Definition & Examples

Natural laws describe how many parts of the natural world work. This lesson defines natural laws and explains the difference between laws and theories. Several examples from physics, biology, and chemistry are also used to illustrate different laws within the natural sciences.

Phase Changes of Matter: Types & Examples

14. Phase Changes of Matter: Types & Examples

We are surrounded by matter. In this lesson, you will learn about phase changes of matter, and the types of phase changes that occur so you can recognize them in the future.

Principal Quantum Number: Definition & Example

15. Principal Quantum Number: Definition & Example

Quantum numbers were developed to characterize electrons - its electron configuration, movement and position in an atom. Each electron has a unique set of quantum numbers. Of the four quantum numbers, our focus in this lesson is the principal quantum number.

Strong Force: Definition, Equation & Examples

16. Strong Force: Definition, Equation & Examples

In this lesson, you'll learn what strong force is, how it holds an atom together, and how it is balanced by electromagnetic repulsion. A short quiz will follow.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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