hat
isit la machin lan ki te deplase ansanm nan direksyon sa a ak vitès la nou te panse sou kat la nan yon tablo Men mwen wi sou sou bò ak en ... doktè fayit te sou bò lanmè a epi nou yo te pouse tounen-ak-soti sou tab la men m pouse li, li antre nan direksyon sa a ak vitès la v lè doktè pa t 'vle fè lè nan direksyon sa a v la vitès menm men sa a se vitès nan relatif nan machin nan sa ki sou vitès la relatif nan yon obsèvatè sou tè a nan sèvo a foto byen si li te pouse nan direksyon sa a li nan vitès ou trase ke yo te si li nan nan direksyon sa a li pral tou gen pou itilize u èspri b sa a se tout trè rezonab se pa gen anyen difisil anpil yo konprann isit la bagay la etone sou sa a ekspresyon se ke li se pa aktè nan tout sikonstans nan vitès trè wo nan gwo vitès mwen vle di vitès pre vitès la nan limyè ekspresyon pann nan sa yo vitès trè wo nou gen yo sèvi ak lide yo sou mouvman relatif devlope pa yon Albert Einstein nan teyori espesyal li nan relativite pou tout vitès la nan la nou ap janm kapab kouri antre nan sa a ekspresyon ki ou plis oswa mwens se konplètman adekwa byen lwen tèlman nou ve yo te ap pale de ankadreman nan referans deplase nan yon konstan relatif vitès nan yon sèl yon lòt kounye a mwen pral fè eksperyans la ak boul la jete ankò sèlman lè sa a kart la yo pral akselere relatif nan ankadreman an latè sa yo pwa pral tonbe epi bay kabwa a yon konstan akselerasyon premye nan tout soti ak Lè sa a, mwen pral reyèlman mete mouvman an se trè vit e mwen vle w yo gade nan pwen an ki kote boul la lage soti nan kamera a pic mwen pa konnen si wi ou non ou te panse ke yo pa nan tèt la nan vout la ak bagay sa yo ki te wa anvan pou swa pwemye li te ateri nan yon tach diferan sa a se paske kabwa a te kenbe sou akselere nan direksyon sa a kòm a boul te tonbe kounye a mwen pral kite w wè l 'ankò ak kamera a ralanti-mouvman fiks sou nan machin nan
eng
here the car which was moving along in this direction with the velocity we were thinking on the card at a table here i am over on the side and uh... doctor doom was on the side and we were pushing back-and-forth on the table well i pushed it and went into this direction with the velocity v when doctor didn't want to do when in this direction the same velocity v but this is the velocity relative to the car what about the velocity relative to an observer on the ground in the picture brain well if it was pushed in this direction it's velocity to you plot being if it's in this direction it will also be used u minded b this is all very reasonable is nothing very hard to understand here the surprising thing about this expression is that it is not actor in all circumstances at very high speed by high speed i mean speeds close to the velocity of light expression breakdown at these very high speed we have to use the ideas about relative motion developed by a albert einstein in his special theory of relativity for all the speed of the we're ever likely to run into this expression you plus or minus the is completely adequate so far we've been talking about frames of reference moving at a constant velocity relative to one another now i'm going to do the experiment with the dropping ball again only that time the karte will be accelerated relative to the earth frame these weight will fall and give the cart a constant acceleration first of all out and then i'll really put the motion is very fast and i want you to watch at the point where the ball is released from the pic camera i don't know whether you thought that are not at the top of the vault with the things that was before for either prime it landed in a different spots this is because the cart kept on accelerating in this direction as the ball was falling now i'm going to let you see it again with the slow-motion camera fixed on to the car