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Ch 8: Relativity: Help and Review

About This Chapter

The Relativity chapter of this SAT Physics Help and Review course is the simplest way to master relativity. 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 relativity.

Who's it for?

Anyone who needs help learning or mastering SAT physics material will benefit from taking this course. You will be able to grasp the subject matter faster, retain critical knowledge longer and earn better SAT scores. You're in the right place if you:

  • Have fallen behind in understanding the basic principles of classical and special relativity
  • Need an efficient way to learn about relativity
  • Learn best with engaging auditory and visual tools
  • Struggle with learning disabilities or learning differences, including autism and ADHD
  • Experience difficulty understanding your teachers
  • Missed class time and need to catch up
  • Can't access extra SAT review resources at school

How it works:

  • Start at the beginning, or identify the topics that you need help with.
  • Watch and learn from fun videos, reviewing as needed.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Submit questions to one of our instructors for personalized support if you need extra help.
  • Verify you're ready by completing the Relativity 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 Relativity chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any relativity question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

In this chapter, you'll learn the answer to questions including:

  • What is classical relativity?
  • How do general and special relativity differ?
  • How is time relative to speed?
  • What are some examples of space contraction?
  • How can mass be converted to energy, and vice versa?

6 Lessons in Chapter 8: Relativity: Help and Review
Classical Relativity: Distance and Time Relation to the Observer

1. Classical Relativity: Distance and Time Relation to the Observer

It is not enough to ask how fast something is moving. We must ask how fast something is moving relative to something else. This lesson describes how classical relativity is used to explain how speed is relative to the state of motion of the object and the observer. Examples are used to help understand classical relativity.

Light and Relativity: Breakdown of Classical Relativity with Light Example

2. Light and Relativity: Breakdown of Classical Relativity with Light Example

The speed of light is constant regardless of the source of the light or the position of the observer. However, the components of speed - distance and time - are relative to speed. This lesson uses examples to explain how the relativity of distance and time accounts for the constant speed of light.

Time Dilation: Description, Explanation & Examples

3. Time Dilation: Description, Explanation & Examples

Time slows down for objects in motion. While this effect is not noticeable in everyday experience, it becomes apparent at speeds approaching the speed of light. This lesson defines this phenomenon as time dilation. Examples are used to help explain how time is relative to speed.

Space Contraction: Shortening Distance for Fast Moving Objects

4. Space Contraction: Shortening Distance for Fast Moving Objects

The length of a moving object decreases in the same direction it travels. This phenomenon is referred to as space or length contraction. Scientists have proven that space contraction occurs and becomes more prominent at speeds close to the speed of light. This lesson uses examples to explain space contraction and describes how space contraction accounts, in part, for the constant speed of light.

Mass and Energy: Description and Interchangeable Relationship

5. Mass and Energy: Description and Interchangeable Relationship

Einstein used E = mc^2 to prove that mass and energy are relative to each other. This lesson describes how energy can be converted into mass and mass into energy. Experimental results from particle accelerators are used to demonstrate the relative nature of mass and energy.

General and Special Relativity: Theory and Examples

6. General and Special Relativity: Theory and Examples

Special relativity accounts for the constant speed of light in the absence of surrounding mass. General relativity utilizes the concept of space-time to explain the effect of gravity on the speed of light. This lesson compares special and general relativity and provides examples of how the speed of light is affected by gravity.

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