# Ch 25: The Orbits of Celestial Bodies

Watch online video lessons to learn about elliptical orbits, the moon's tidal force, the acceleration of gravity, and more. Take advantage of the short quizzes that follow each lesson to gauge your progress.

## Orbits, Tides, and Gravity - Chapter Summary and Learning Objectives

Let our instructors help you make sense of the kinematics equations used to calculate the effects of gravity on the acceleration, speed, and velocity of an object in orbit. You can also take a closer look at how the moon's gravitational forces affect our oceans. By the time you reach the end of this chapter, you should be familiar with the following:

• Orbital shapes, speeds, and periods
• The effect of gravity on orbits
• Gravitational forces between the Earth and moon
• Acceleration in free fall motion

Video Objectives
Elliptical Orbits: Periods & Speeds Practice solving formulas used to calculate orbiting objects' speeds and periods.
Eccentricity and Orbits of Planets Learn about planetary orbits that diverge from a perfect circle.
The Effect of Gravity & Energy on Orbits Discover how gravity affects an object's orbit. Examine concepts like escape velocity and atmospheric drag.
The Effect of Gravity, the Moon & the Sun on Tides Explore the relationship between the tidal forces of the moon and sun and the tidal cycles on Earth.
The Effect of Tidal Friction on Earth and the Moon Discover how tidal friction on Earth explains the moon's rotation.
Free Fall Physics Practice Problems Get experience solving the types of equations used to calculate variables associated with free fall motion.
The Acceleration of Gravity: Definition & Formula Learn to measure the effect of gravity on an object's acceleration.

9 Lessons in Chapter 25: The Orbits of Celestial Bodies
Test your knowledge with a 30-question chapter practice test
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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