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The text explains common everyday uses of time, then highlights measurement as the key to understanding what time is, quoting Einstein’s definition for how time is measured with a clock. It motivates a guided exploration of special relativity, movement, and the speed of light, previewing surprising phenomena that appear like science fiction but occur in the 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\nButton  \nB0OKS  \nSHEDDAD KAID-SALAH FERRON&EDUARD ALTARRIBA  \n\n| CONTENTS   |  |  |\n| --- | --- | --- |\n| ⑤  \u003Cbr>INTRODUCTION  \u003Cbr>G  \u003Cbr>TIME  \u003Cbr>8  \u003Cbr>MEASURING TIME   |  |  |\n|  | 10  \u003Cbr>CLOCKS &WATCHES  \u003Cbr>12  \u003Cbr>SPACE  \u003Cbr>14  \u003Cbr>SPEED   | TY   |\n|  | 16  \u003Cbr>MOVEMENT  \u003Cbr>17  \u003Cbr>FRAMES OF REFERENCE  \u003Cbr>22  \u003Cbr>ADDING UP SPEEDS  \u003Cbr>24  \u003Cbr>THE SPEED OF LIGHT  \u003Cbr>25  \u003Cbr>WE ALWAYS SEE THE PAST  \u003Cbr>27  \u003Cbr>THE THEORY OF(SPECIALJ RELATIVI  \u003Cbr>28  \u003Cbr>TIME IS NOT WHAT IT SEEMS  \u003Cbr>30  \u003Cbr>TIME DILATION:FIRING MARBLES   |  |\n\n32  \nTIME DILATION:FIRING PHOTONS  \n34  \nA LIGHT CLOCK  \n36  \nJOURNEY TO THE FUTURE  \n38  \nLENGTH CONTRACTION  \n④0  \nTHE MUON'S JOURNEY  \nSPEED MAKES THINGS HEAVIER  \n④2  \n④4  \nSURFING THE LIGHT  \nA MATHEMATICAL UNIVERSE  \n④7  \n48  \nACKNOWLEDGEMENTS  \n进ALBERT EINSTEIN  \n# INTRODUCTION\n\nAlbert Einstein's Relativity is the theory of space and time.We all instinctivelyknow what TIME and SPACE are.Although they seem to be simple concepts,we'll see that if we think about them a bit,fascinating things happen.  \nWhen he was a teenager,Einstein used to wonder why something that otherpeople understood perfectly kept on going round and round in his head.Because he questioned it and thought about it so much,many years later he wasable to develop his Space-Time theory,the theory of SPECIAL RELATIVITY.(It is called this because years later he also developed the theory of GENERALRELATIVITY,which involves space and time as well as other factors like gravity.)  \nSo to understand the Space-Time theory,first we need to understand what eachof these two concepts,space and time,really mean.And it will also help us toknow what movement is and what happens with the speed of light.Then,likeEinstein,once we've got that sorted,we'l be able to understand the worldthrough RELATIVITY.And we'll discover that things that seem to be sciencefiction really do happen in our universe.  \n# Welcome to this amazing journey!\n\nMESomeone wakes you up and says that the alarm went offages ago and you'l have to eat your breakfast quickly if youdon't want to be late for school.You stayed up reading latelast night and now you wish you hadn't.You force your eyes open and look at the clock.It's true.You've onlygot twenty minutes before the bus comes.And you've already beenlate once this week.  \nWe all know what time is.We use it constantly to know what to doand when to do it.We organize our lives around units of time-seconds,minutes,hours,days,weeks,months,years,etc.  \nBut if someone asks us what time actually is,things get a bitcomplicated.Great thinkers have tried to define it,but for usthe most important thing about time is that we can measure it.So,how do we measure time?Einstein was quite clear:\"TIME IS WHAT WEMEASURE WITH.A CLOCK”。But how does a clock-measure time?","cbCaihufH6DIat7W","https://ap.wps.com/l/cbCaihufH6DIat7W","pdf",4120096,56,"English","# INTRODUCTION\n## Welcome to this amazing journey!","[{\"question\":\"Why does the document say time becomes complicated when asked what time actually is?\",\"answer\":\"It notes that many thinkers have tried to define time, but the most important aspect for the discussion is that time can be measured.\"},{\"question\":\"How does Einstein define time in the document?\",\"answer\":\"It quotes Einstein: “TIME IS WHAT WE MEASURE WITH A CLOCK.”\"},{\"question\":\"What does the introduction say you need to understand before learning special relativity?\",\"answer\":\"It states that space and time need to be understood first, along with what movement means and what happens at the speed of light.\"}]","MY FIRST BOOK OF RELATIVITY - Introduction - Welcome to this amazing journey! | PDF",1791876351,86]