# Length Contraction

## As the velocity of an object approaches the speed of light it appears to change length to a stationary observer.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Length Contraction

Students will learn how length contraction follows from time dilation and the meaning of the gamma factor.
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• Interactive Simulations

## Black Hole

Watch a clock slow down in the strong gravitational field near the event horizon of a massive black hole.
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• Video

## Time Dilation

Explains why there is time dilation for objects moving close to the speed of light.
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• Video

## The Relativity of Length - Overview

by CK-12 //basic
Overview
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• Video

## The Relativity of Length - Example 2

by CK-12 //basic
Determining the observed length of an object in a fixed frame of reference using the equation L = L[0] √ (1- (v^(2)/c^(2)))
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• Video

## The Relativity of Length - Example 1

by CK-12 //basic
Recognizing how the perceived length of an object changes as it approaches the speed of light
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• Critical Thinking

## Length Contraction Discussion Questions

A list of student-submitted discussion questions for Length Contraction.
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• Real World Application

## Watch it Shrink!

How does the concept of length contraction affect how objects appear to us?
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• Study Guide