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Ch 20: Praxis General Science: Laws of Gravitation

About This Chapter

The lessons of this chapter have been assembled to help you prepare for questions about Newton's Law of Gravitation, Kepler's three laws of planetary motion, gravitational force and the properties of orbits so that you will be prepared for related questions on the Praxis General Science exam.

Praxis General Science: Laws of Gravitation - Chapter Summary

From these lessons, you should gain a better understanding of the laws of gravity and discover how they explain the nature of gravity, planetary motion and the physics of orbits. Each lesson video is taught by an expert instructor who will explain these topics and help you prepare for related questions on the Praxis General Science exam. Once you've completed these lessons, you should be better prepared for questions about:

  • Gravity and Newton's law
  • The nature and force of gravitational attraction between bodies
  • Formulas for gravitational potential energy
  • Applications for Kepler's laws of planetary motion
  • Periods and speeds of elliptical orbits
  • The orbits of planets and eccentricity

To help ensure that you retain the information presented in these lessons, read over the transcripts. These written overviews will not only help you improve your retention of the material but also help you study the key vocabulary of the chapter. After you have studied a lesson, make sure you know what you need to know from it by completing the quiz that accompanies it. Then examine your quiz results to identify the topics you don't understand and use the video tags to reinforce your comprehension of those topics.

6 Lessons in Chapter 20: Praxis General Science: Laws of Gravitation
Test your knowledge with a 30-question chapter practice test
Newton's Law of Gravitation: Definition & Examples

1. Newton's Law of Gravitation: Definition & Examples

This lesson explains how gravity works mathematically and teaches you how to use Newton's Law of Gravitation to solve problems. A short quiz will follow.

Gravitational Attraction of Extended Bodies

2. Gravitational Attraction of Extended Bodies

After watching this lesson, you will be able to explain what an extended body is, understand the derivation for the force of gravity between a point charge and a long, thin bar and solve problems using the result of that derivation.

Gravitational Potential Energy: Definition, Formula & Examples

3. Gravitational Potential Energy: Definition, Formula & Examples

In this lesson, you will learn what gravitational potential is, the equation we use to calculate it, and how to use that equation. We'll look at some real-life examples so you can see how it works. A short quiz will follow.

Kepler's Three Laws of Planetary Motion

4. Kepler's Three Laws of Planetary Motion

Find out about the interesting life and major contributions of Johannes Kepler. This lesson will also teach you how to find out how long it takes a planet to revolve around the sun!

Elliptical Orbits: Periods & Speeds

5. Elliptical Orbits: Periods & Speeds

After watching this lesson, you will be able to explain what an elliptical orbit is and calculate the period and speed of an object in an elliptical orbit, if given enough information. A short quiz will follow.

Eccentricity & Orbits of Planets

6. Eccentricity & Orbits of Planets

After watching this lesson, you should be able to explain what eccentricity is and calculate the eccentricity of an orbit given relevant distance measurements. A short quiz will follow.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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