Modern Physics April 30, 2009. Motion is Relative Frame of Reference - perspective from which you observe.

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Presentation transcript:

Modern Physics April 30, 2009

Motion is Relative Frame of Reference - perspective from which you observe

Special Theory of Relativity (1905) – describes how time is affected by motion and how mass and energy are related

1 st Postulate = Observers cannot detect their uniform motion, except relative to other objects.

2 nd Postulate = The speed of light, c, is constant and is the same for all observers.

Time Dilation Video Clip fendt.de/ph14e/timedilation.htm iencetwin/index.html

Time dilation = time stretches or slows as an observer approaches the speed of light Moving clocks run slow

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Time dilation equation Moving Time Proper Time

Time dilation simplified Time onboard the spaceship Time on earth % of the speed of light

Example) Superman leaves Lois in Metropolis to rescue a spaceship. Flying at a speed of 0.70c, Superman reaches the ship in 20 hours according to his wristwatch. How long did the trip take according to Lois’ clock on Earth?

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