| | .jpg)
<´ÙÀ½ ¾îÈÖ¸¦ Ȱ¿ëÇÏ¿© ºóÄÀ» ä¿öº¸¼¼¿ä> ( give off, even though, get tired, standing still ) Imagine that you and your friends have not done any work today. ¿©·¯ºÐ°ú ¿©·¯ºÐÀÇ Ä£±¸°¡ ¿À´Ã ¾Æ¹«°Íµµ ÇÑ ÀÏÀÌ ¾ø´Ù°í »ó»óÇØ º¾½Ã´Ù. However, you all still feel tired. ±×·±µ¥µµ ¿©·¯ºÐ ¸ðµÎ´Â ÇǷθ¦ ´À³§´Ï´Ù. None of you has any energy. ¾Æ¹«µµ ¿¡³ÊÁö°¡ ¾øÁÒ. Is this possible? ±×°Ô °¡´ÉÇÒ±î¿ä? A person can get tired without doing work. »ç¶÷Àº ¾Æ¹« ÀÏÀ» ÇÏÁö ¾Ê°íµµ ÇǷθ¦ ´À³¥ ¼ö ÀÖ½À´Ï´Ù. To understand how, you must understand what energy and work mean to a scientist. À̰ÍÀ» ÀÌÇØÇϱâ À§ÇØ ¿©·¯ºÐÀº °úÇÐÀÚµéÀÌ Á¤ÀÇÇÏ´Â ¿¡³ÊÁö¿Í ÀÏÀÇ °³³äÀ» ÀÌÇØÇØ¾ßÇÕ´Ï´Ù. Scientists define energy as the ability to do work. °úÇÐÀÚµéÀº ¿¡³ÊÁö¸¦ ÀÏÀ» ÇÒ ¼ö ÀÖ´Â ´É·ÂÀ̶ó°í Á¤ÀÇÇÕ´Ï´Ù. They define work as something that involves moving or changing an object. °úÇÐÀÚµéÀº ÀÏÀ» ¹°Ã¼¸¦ ¿òÁ÷À̰ųª º¯È½ÃŰ´Â °Í°ú °ü·ÃµÈ °ÍÀ¸·Î Á¤ÀÇÇÕ´Ï´Ù. Now, imagine that you are (1)_______________ while holding a pile of heavy books. ÀÚ, ¿©·¯ºÐÀÌ ¸Å¿ì ¹«°Å¿î Ã¥µéÀ» µé°í Á¤ÁöÇÑ »óÅ·Π¼ ÀÖ´Ù°í »ó»óÇØº¸¼¼¿ä. You are not changing the books. ¿©·¯ºÐÀº Ã¥À» º¯È½Ã۰í ÀÖÁö ¾Ê½À´Ï´Ù. You are not moving the books. ¿©·¯ºÐÀ» Ã¥µéÀ» ¿Å±â°í ÀÖÁöµµ ¾Ê½À´Ï´Ù Scientists would say that you are not doing any work. °úÇÐÀÚµéÀº ¿©·¯ºÐÀÌ ¾Æ¹« Àϵµ ÇÏÁö ¾Ê°í ÀÖ´Ù°í Çϰڱº¿ä. But you can still (2)________________ from holding the books. ±×·¯³ª ¿©·¯ºÐÀº Ã¥À» µé°í ÀÖ´À¶ó ¿©ÀüÈ÷ ÈûÀÌ µçµ¥µµ ¸»ÀÔ´Ï´Ù. So, you can get tired (3)_____________________ a scientist would not say you are doing any ¡°work¡±! ±×·¡¼ °úÇÐÀÚµéÀÌ ¾Æ¹« Àϵµ ÇÏÁö ¾Ê´Â °ÍÀ¸·Î ¿©±æ ¶§¿¡µµ ÇǰïÇÒ ¼ö ÀÖ½À´Ï´Ù.. Your body uses energy from food to do work. ÀÏÀ» Çϱâ À§Çؼ ¿©·¯ºÐÀÇ ¸öÀº À½½Ä¹°À» ÇÊ¿ä·Î ÇÕ´Ï´Ù. Energy from food is called chemical energy. À½½Ä¿¡¼ ¾ò´Â ¿¡³ÊÁö¸¦ ÈÇп¡³ÊÁö¶ó°í ºÎ¸¨´Ï´Ù. You cannot see chemical energy, but you can feel it working. ÈÇп¡³ÊÁö´Â ´«À¸·Î º¸ÀÌÁö ¾ÊÁö¸¸ ÀÛ¿ëÇÏ´Â °ÍÀ» ´À³¥ ¼ö°¡ ÀÖÀ» °Ì´Ï´Ù. There are many other forms of energy in the world around you. ¿©·¯ºÐÀÇ ÁÖº¯¿¡¼´Â ´Ù¸¥ ¸¹Àº ÇüÅÂÀÇ ¿¡³ÊÁö°¡ Á¸ÀçÇÕ´Ï´Ù. You can notice some types of energy with your senses. ¿©·¯ºÐÀÇ °¨°¢À¸·Î ¿©·¯ Á¾·ùÀÇ ¿¡³ÊÁö¸¦ ´À³¥ ¼ö ÀÖ½À´Ï´Ù. When you walk into a dark room, you might turn on a lamp. ¾îµÎ¿î ¹æÀ¸·Î µé¾î°¥ ¶§´Â, ÀüµîÀ» ų °ÍÀÔ´Ï´Ù. Lamps give off light energy. ÀüµîÀº ºû ¿¡³ÊÁö¸¦ ¹ß»êÇÕ´Ï´Ù. You can sense light energy with your eyes. ¿©·¯ºÐÀº ´«À¸·Î ºû ¿¡³ÊÁö¸¦ °¨ÁöÇÕ´Ï´Ù. When someone rings a doorbell, it produces sound energy. ´©±º°¡ ÃÊÀÎÁ¾À» ¿ï¸®¸é ¼Ò¸®¿¡³ÊÁö°¡ »ý¼ºµË´Ï´Ù. You can sense sound energy with your ears. ¿©·¯ºÐÀº ±Í·Î ¼Ò¸®¿¡³ÊÁö¸¦ °¨ÁöÇÕ´Ï´Ù. Stoves produce heat energy to cook food. ½ºÅäºê¿¡¼´Â À½½ÄÀ» Á¶¸®ÇÒ ¼ö ÀÖ´Â ¿ ¿¡³ÊÁö¸¦ ¸¸µé¾î³À´Ï´Ù. You can feel heat energy warm your skin. ¿©·¯ºÐÀº ÇǺηΠ¿ ¿¡³ÊÁö¸¦ ´À³¥ ¼ö°¡ ÀÖ½À´Ï´Ù. Lamps, doorbells, and stoves all (4)_______________ different types of energy. Àüµî, ÃÊÀÎÁ¾, ±×¸®°í ½ºÅäºê´Â °¢±â ´Ù¸¥ Á¾·ùÀÇ ¿¡³ÊÁö¸¦ ¹ß»êÇÕ´Ï´Ù. Answers (1) standing still (2) get tired (3) even though (4) give off |
|