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| Einstein concluded that if an _________ was traveling near the speed of light, he would measure the light moving away from him at c, 300,000 km/s. |
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| All the laws of physics are the same in all ______________ moving frames of reference. |
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| uniformly First Postulate of Special Relativity |
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| A spaceship needs an object to ____________ its speed. |
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Definition
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| A space ship can/cannot measure its speed relative to empty space. |
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| All ___________ of ____________ are arbitrary. |
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| Einstein reasoned that the constancy of the _____________ unifies time and space. |
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Definition
| Amount of space traveled compared to the time of travel. Speed = space/time |
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| _______________ can vary the speed of light in empty space? |
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Term
| If the speed of a baseball were constant and if it were thrown at you at 5 m/s. At what speed do you catch the baseball? |
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Definition
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| If the speed of a baseball were constant and if it were thrown at you at 5 m/s from a truck traveling away from you at 60 m/s. At what speed do you catch the baseball? |
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| If the speed of a baseball were constant and it were thrown at you at 5 m/s from a truck traveling toward you at 60 m/s, what speed do you catch the baseball? |
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| The speed of common objects is _____________. |
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| From the frame of reference of the photon. How long does it take you to travel from one end of the universe to the other? |
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Definition
| The journey takes no time. Since you are going the speed of light, you are not traveling through time, you are only traveling through space. |
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Term
| Does light travel through space or time? |
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Definition
| Light only travels through space. It never travels through time. |
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| If you could travel at the speed of light, would you travel through space or time? |
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Definition
| All of your travel would be through space-you would not travel through time. |
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Term
| When you walk, do you travel through space or time? |
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Definition
| When you walk you travel both through space and time, but mostly through time. |
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| When you stand still are you traveling through space or time? |
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Definition
| When you stand still, all your travel is through time. |
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| Is time an absolute quantity? |
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Definition
| No. Time dilation. The spaceship example shows that time is not absolute |
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Definition
| Any device that measures periodic intervals |
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| If a flashing clock is in a space ship moving close to C. What does the clock look like to the people on the ship? |
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Definition
| It is the correct time, moving at the correct intervals |
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Term
| If a flashing clock is in a spaceship moving close to C. What does the clock look like to someone outside the ship? |
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Definition
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Term
| Alpha Centauri is 4 light years away. How long, traveling close to C, does it take you to go there and back? |
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Definition
| Not long. If you go at close to C, with time dilation, you are traveling through space, not time. |
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Term
| Alpha Centauri is 4 light years away. How long will it take a person to get there and back according to a person on Earth? |
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Definition
| 8 years. If the traveler goes close to C, in Earth’s frame reference it will take 4 years to get there and 4 years to get back. |
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| A person moving close to C can keep jumping into the future when they come back to Earth. Can they go back to the past? |
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Definition
| No. Time only travels one way-forward. |
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