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# 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

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

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

Works through an example using the time dilation formula.

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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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• Practice
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## Time Dilation Quiz - PPB

Quiz on time dilation.

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• Critical Thinking

## Time Dilation Discussion Questions

A list of student-submitted discussion questions for Time Dilation.

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• Study Guide