Ch 7: Orbits, Tides, and Gravity: Help and Review

About This Chapter

The Orbits, Tides and Gravity chapter of this Intro to Astronomy Help and Review course is the simplest way to master orbits, tides and gravity. This chapter uses simple and fun videos that are about five minutes long plus lesson quizzes and a chapter exam to ensure students learn the essentials of the subject.

Who's it for?

Anyone who needs help learning or mastering Intro to Astronomy material will benefit from taking this course. There is no faster or easier way to learn introductory astronomy. Among those who would benefit are:

  • Students who have fallen behind in understanding orbits, tides and gravity
  • 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 orbits, tides and gravity
  • 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 Orbits, Tides and Gravity 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 Orbits, Tides and Gravity chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any Orbits, Tides and Gravity question. 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 an Orbits, Tides and Gravity unit of a standard Intro to Astronomy course. Topics covered include:

  • Periods and speeds of elliptical orbits
  • Eccentricity and orbits of planets
  • The effect of gravity and energy on orbits
  • The effect of gravity, the moon and the Sun on tides
  • The effect of tidal friction on Earth and the moon
  • Free-fall physics
  • Defining the acceleration of gravity

10 Lessons in Chapter 7: Orbits, Tides, and Gravity: Help and Review
Test your knowledge with a 30-question chapter practice test
Free Fall Physics Practice Problems

1. Free Fall Physics Practice Problems

In this lesson, we will dive into doing calculations involving free falling objects. We will begin with a few helpful tips to get started before working through a couple of example problems.

The Acceleration of Gravity: Definition & Formula

2. The Acceleration of Gravity: Definition & Formula

In this lesson, we will introduce the acceleration due to gravity. Objects in free fall are one of the few real world examples of straight line motion with constant acceleration, so they are commonly used when learning kinematics.

The Four Kinds of Trajectories for Celestial Objects

3. The Four Kinds of Trajectories for Celestial Objects

What does the slicing apart of a cone and the resultant shapes have to do with trajectories and escape velocity? This lesson will tell you as it goes over ellipses, circles, hyperbolas, and parabolas.

Elliptical Orbits: Periods & Speeds

4. 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

5. 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.

Center of Mass, The Barycenter & Orbital Motion

6. Center of Mass, The Barycenter & Orbital Motion

This lesson will tell you what orbits around what: the sun around the Earth or the Earth around the sun. The same goes for the moon and Earth. Does the moon really orbit around the Earth?

Circular Velocity & Escape Velocity

7. Circular Velocity & Escape Velocity

This lesson will describe the concepts of circular velocity, escape velocity, open orbits, closed orbits, and geosynchronous satellites. It will provide the equations necessary for you to be able to calculate out circular and escape velocity as well.

How Orbits Are Influenced by Gravity & Energy

8. How Orbits Are Influenced by Gravity & Energy

This lesson will explain how potential energy, kinetic energy, speed, and gravity are linked to the orbital motion of planets in our solar system. It will also define aphelion and perihelion.

Kepler's Laws, Ellipses, and Eccentricity

9. Kepler's Laws, Ellipses, and Eccentricity

This lesson will discuss Kepler's First Law of Planetary Motion; define an ellipse, focus, major axis, semimajor axis, and eccentricity; and explain what they have to do with astronomy.

Planets of the Solar System: Orbits & Visibility

10. Planets of the Solar System: Orbits & Visibility

This lesson will tell you which planets in our solar system you can see with the naked eye and which ones you cannot. You'll also learn how they appear to move in our sky and why we can see them in the first place.

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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