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Level 196

Special Relativity & General Relativity


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Connected universe
Before Einstein on space
Before Einstein on time
Constant rate for everyone everywhere
Light travels at
300,000 km/s = 3 x 10^8 m/s
Move through time
Move through space -->
Space-time
A combination of space and time, which are viewed in special relativity as two parts of one whole
Travel closer to the speed of light
Travel faster --> time slows and travel through space
Standing still and time
Still Travelling through time
Time-dilation
Time slows when you move near the speed of light
Einsteins special theory of relativity
How time is affected by motion in space at constant velocity, and how mass and energy are related
First postulate of special relativity
Object can measure its speed relative to other objects
uniform motion
constant velocity with no change in direction
Second postulate of special relativity
Speed of light in the vacuum will have the same value regardless of the motion of the source/observer
speed of light
186,000 miles a second or 700 million miles an hour.
Speed = distance / time
It takes more time to go greater distance
Einsteins correction factor
So it doesn't go at speed of light
Twin Paradox
A paradox where one twin goes to space at a speed close to light, but her twin stays on Earth. After twenty years, the twin comes back to Earth. She aged 2 years, but…
Time-dilation occurs to which twin
Twin reaching speed of light
special relativity
invented by einstein in 1905. Branch of modern physics that deals with really fast stuff (greater than 99% the speed of light)
General relativity
Accelerating objects
mass
a body of coherent matter, usually of indefinite shape and often of considerable size
Length shrinks
Rocket approaches speed of light
Two spaceships with uniform motion seem to pass each other in empty space -->
No experiment can be performed to tell which is moving and which is standing still
E = mc^2
Mass increases as you approach the speed of light
Energy and mass are two sides of the same coin
Small amount of energy can be changed into large amount of mass
4 dimensions
Space-time has new geographical dimensions