About This Chapter
Praxis Physics: Laws of Gravitation - Chapter Summary
In these lessons our professional instructors will help you prepare for questions on the Praxis Physics exam regarding the laws of gravity. In this review they will explain the concept of gravity, Newton's law of universal gravitation and Kepler's three laws of planetary motion. After this chapter you should have a better understanding of:
- Gravitational attraction
- Gravitational potential energy
- Newton's laws in relation to weight, mass and gravity
- Planetary motion and Kepler's three laws
- Periods and speeds of elliptical orbits
- Planetary orbits and eccentricity
Since these lessons are mobile device compatible you can watch them on any internet ready mobile device when you are away from your computer. Following these lesson videos, reinforce your understanding of the material presented in them by reading the lesson transcripts. Then take the lesson quizzes to identify any topics you don't understand and use the video tags to return to and study the sections of the lessons that explained the topics you missed.
Praxis Physics: Laws of Gravitation Objectives
The Praxis Physics exam is used by some states to ensure that future physics teachers know what they need to know about their field of study before they teach students of high school physics classes. This computer-based exam is composed of 125 selected-response questions, which you will be given 2.5-hours to answer. When preparing for this exam keep in mind that 32% of these questions will be about mechanics and may include some questions about the laws of gravitation.
1. The Law of Universal Gravitation: Definition, Importance & Examples
Gravity is what pulls us toward Earth, but it's also what pulls Earth toward us. This is explained by the law of universal gravitation, which describes how all objects in the universe have this important force between them.
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.
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.
4. Newton's Laws and Weight, Mass & Gravity
Did you know that mass and weight are not the same? This lesson describes the difference between the two as well as the effect of gravity on weight. Examples are used to teach you how to calculate weight based on mass and acceleration of gravity.
5. 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!
6. 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.
7. 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.
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Other chapters within the Praxis Physics (5265): Practice & Study Guide course
- Praxis Physics: Scientific Inquiry & Social Perspective
- Praxis Physics: Scientific Procedures & Techniques
- Praxis Physics: Vectors & Scalars
- Praxis Physics: Kinematics
- Praxis Physics: Motion
- Praxis Physics: Oscillations
- Praxis Physics: Work, Energy & Power
- Praxis Physics: Linear Momentum
- Praxis Physics: Rotational Motion, Collisions & Conservation
- Praxis Physics: Fluid Mechanics
- Praxis Physics: Electrical Forces & Fields
- Praxis Physics: Potential & Capacitance
- Praxis Physics: Direct Current Circuits
- Praxis Physics: Magnetism
- Praxis Physics: Optics & Waves
- Praxis Physics: Heat, Energy & Thermodynamics
- Praxis Physics: Modern Physics & Atomic Structure
- Praxis Physics: Content Knowledge Flashcards