# Time Dilation

## As the velocity of an object approaches the speed of light it appears to move more slowly through time 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.

## Time Dilation

by CK-12 //at grade
Students will learn what is meant by time dilation in relativity theory and how to solve relative time problems.
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• Interactive Simulations

## Black Hole

by CK-12 //at grade
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 Example Problem

by CK-12 //at grade
Works through an example using the time dilation formula.
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• Video

## Time Dilation

by CK-12 //at grade
Explains why there is time dilation for objects moving close to the speed of light.
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• Critical Thinking

## Time Dilation Discussion Questions

by CK-12 //at grade
A list of student-submitted discussion questions for Time Dilation.
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• Study Guide

## Relativity Study Guide

by CK-12 //at grade
This study guide gives an overview of special relativity and general relativity: a look at time dilation, length contraction, relativistic mass and kinetic energy, twins paradox, and spacetime.
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