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Time(½Ã°£)À̶ó´Â °³³äÀº length(±æÀÌ) ¹× mass(Áú·®)¿Í ÇÔ²² physical unit(¹°¸® ´ÜÀ§)À» ±¸¼ºÇÏ´Â basic unit(±âº» ´ÜÀ§)ÀÌ´Ù. TimeÀº second(ÃÊ)¿Í minute(ºÐ), ±×¸®°í hour(½Ã°£)¸¦ ÀÌ¿ëÇØ physical quantity(¹°¸®·®)¸¦ ³ªÅ¸³½´Ù. Classical physics(°íÀü¹°¸®ÇÐ)¿¡¼ timeÀ̶õ three-dimensional space(3Â÷¿ø °ø°£)¿¡¼ ÀϾ´Â physical phenomenon(¹°¸®Àû Çö»ó)À» ¼³¸íÇϱâ À§ÇØ µµÀÔÇÑ parameter(¸Å°³º¯¼ö)ÀÌ´Ù. Physical principle(¹°¸®¹ýÄ¢)¿¡ ÀÇÇØ ÀÔÁõµÇ´Â natural phenomenon(ÀÚ¿¬Çö»ó)ÀÌ Á¸ÀçÇÒ °æ¿ì, ±× phenomenon(Çö»ó)ÀÌ ¹Ýº¹µÇ´Â Áֱ⸦ °¡Áö°í physical time(¹°¸®Àû ½Ã°£)À» Á¤ÇÑ´Ù. ¿¹¸¦ µé¾î, Áö±¸ÀÇ rotation(ÀÚÀü)ÀÌ physical phenomenonÀ̶ó¸é mean solar time(Æò±Õžç½Ã)ÀÇ second¿Í second »çÀÌÀÇ °£°ÝÀÌ physical timeÀÌ µÈ´Ù. _º»¹® 14ÂÊ basic concept Áß¿¡¼
Although time is a difficult concept to define, it is the most accurately measured physical quantity. A measurement of time assigns a unique number to either an epoch or a time interval. An epoch specifies the moment when an instantaneous event occurs, while a time interval refers to the duration of a continued event. Time can also be measured using the progress of any phenomenon that undergoes regular changes. _º»¹® 19ÂÊ reading physics Áß¿¡¼
Example 1 The graph represents the positions of objects A and B which move on the same straight line. Choose all correct answers that explain the movement of A and B between 0 and 20 seconds.
a. A shows uniform motion while B shows accelerated motion.
b. Travelled distance of B is bigger than A.
c. Average speed of A and B are same.
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