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Èû°ú¿îµ¿(force and motion)

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TZ-SHR-1130009
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2020.12.31
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8 page / 151.0 KB
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¿¬°ü ÃßõÀÚ·á
 Èû°ú¿îµ¿(force and motion) #1 Èû°ú¿îµ¿(force and motion) #2 Èû°ú¿îµ¿(force and motion) #3
 Èû°ú¿îµ¿(force and motion) #4 Èû°ú¿îµ¿(force and motion) #5 Èû°ú¿îµ¿(force and motion) #6
 Èû°ú¿îµ¿(force and motion) #7 Èû°ú¿îµ¿(force and motion) #8

Èû°ú ¿îµ¿-1(force and motion)   ÇнÀ ¸ñÇ¥  
-ÈûÀº º¤ÅÍ·®À̹ǷÎ, Å©±â¿Í ¹æÇâ, ±×¸®°í ¼ººÐµéÀÌ ÀÖ´Ù.
-°°Àº ÀÔÀÚ¿¡ µÑ ȤÀº ±× ÀÌ»óÀÇ ÈûÀÇ ÀÛ¿ëÇÒ ¶§ ÀÌ ÈûµéÀ» º¤ÅÍ·Î ¾ËÂ¥Èû(net force)À» ±¸ÇÑ´Ù.
-´ºÅÏÀÇ ¿îµ¿ Á¦ 1, 2 ¹ýÄ¢(newtons first and second law of motion)À» ¼³¸í ÇÒ ¼ö ÀÖ´Ù.
-°ü¼º ±âÁØƲ(inertial reference frames)À» ¼³¸íÇÒ ¼ö ÀÖ´Ù.
-¹°Ã¼¿¡ ÀÛ¿ëÇÏ´Â ¾ËÂ¥Èû°ú ¹°Ã¼ÀÇ Áú·®, ±×¸®°í ¾ËÂ¥Èû¿¡ ÀÇÇØ ³ªÅ¸³ª´Â °¡¼Óµµ »çÀÌÀÇ °ü°è¸¦ ¸Î´Â´Ù.
-¹°Ã¼¿¡ ÀÛ¿ëÇÏ´Â ¿ÜºÎ Èû¸¸ÀÌ ¹°Ã¼¸¦ °¡¼Ó½Ãų ¼ö ÀÖ´Ù.
1) ´ºÅÏ Á¦ 1¹ýÄ¢
-¹°Ã¼¿¡ ÈûÀÌ ÀÛ¿ëÇÏÁö ¾ÊÀ¸¸é ¹°Ã¼ÀÇ ¼Óµµ´Â º¯ÇÏÁö ¾Ê´Â´Ù.Áï ¹°Ã¼ÀÇ °¡¼ÓµÇÁö ¾Ê´Â´Ù.
if no force acts on a body, the bodys velocity cannot change: that is the body cannot accelerate
-¹°Ã¼¿¡ ÀÛ¿ëÇÏ´Â ¾ËÂ¥ÈûÀÌ 0À̸é({vecf} {n et} 0) ¹°Ã¼ÀÇ ¼Óµµ´Â º¯ÇÏÁö ¾Ê´Â´Ù.Áï ¹°Ã¼ÀÇ °¡¼ÓµÇÁö ¾Ê´Â´Ù.
if no net force acts on a body, the bodys velocity cannot change: that is the body cannot accelerate
2) Èû(force)
-1kgÀÎ ¹°Ã¼¸¦ rm 1m/s^2ÀÇ °¡¼Óµµ·Î ¿îµ¿½ÃÅ°±â À§ÇØ ÇÊ¿äÇÑ ÈûÀ» 1nÀ¸·Î Á¤ÀÇÇÑ´Ù.
-ÈûÀº º¤ÅÍ·®À̹ǷΠº¤ÅÍÀÇ °è»ê ±ÔÄ¢¿¡ µû¶ó ÈûÀ» ÇÕ¼ºÇÒ ¼ö ÀÖ´Ù.
-ÈûÀÇ ÁßøÀÇ ¿ø¸®(principle of superposition for force): ÇÑ ¹°Ã¼¿¡ ¿©·¯ ÈûÀÌ ÀÛ¿ëÇÒ ¶§ °è»êµÈ ¾ËÂ¥Èû°ú Å©±â¿Í ¹æÇâÀÌ °°Àº ÇÑ ÈûÀº ¹°Ã¼¿¡ °°Àº È¿°ú¸¦ ÁØ´Ù.
-ÇÕ·Â(resultant force)°ú ¾ËÂ¥Èû(net force)´Â ¾à°£ ´Ù¸¥ °³³äÀ¸·Î ¾²À̱⵵ ÇÑ´Ù.
rm 1 ``n ```` (1 ``kg)(1 ``m/s^2 ) ```` 1 `` kg ```` m/s^2
rm1``n````1``kg cdot m/s ^{2} ````(1)(1 ``g) cdot (100``cm)/s ^{2} ````10 ^{5} ``g cdot cm/s ^{2} ````10 ^{5} ``dyne
3) °ü¼º±âÁØƲ(inertial reference frames) ¶Ç´Â °ü¼ºÆ²(inertial frames)
-´ºÅÏÀÇ ¿îµ¿ Á¦ 1¹ýÄ¢ÀÌ Àû¿ëµÇ´Â ±âÁØƲÀ» °ü¼º±âÁØƲÀ̶ó°í ÇÑ´Ù.
-Áö±¸ÀÇ ÀÚÀüÀ» ¹«½ÃÇÑ´Ù¸é Áö¸éÀº °ü¼º±âÁصéÀÌ´Ù.
-±×·¯³ª Áö±¸ÀÇ ÀÚÀüÀ» °í·ÁÇÑ´Ù¸é Áö±¸´Â °ü¼º±âÁØƲÀÌ ¾Æ´Ï´Ù.ÀÌ·¯ÇÑ °æ¿ì Áö¸éÀº ºñ°ü¼ºÆ²( noninertial frame)À̶ó ÇÑ´Ù.
4) Áú·®(°ü¼ºÁú·®(inertial mass)): ¹°Ã¼¿¡ ÀÛ¿ëÇÏ´Â Èû°ú ±× °á°ú·Î »ý±â´Â °¡¼Óµµ¸¦ ¿¬°ü½ÃÄÑÁÖ´Â ¹°¸®Àû Ư¼º.¹°Ã¼¿¡ ÈûÀ» °¡ÇÏ¸é ¼Óµµ°¡ º¯È­µÈ´Ù.¼ÓµµÀÇ º¯È­À²¿¡ ÇØ´çÇÏ´Â °¡¼Óµµ¿Í ÁÖ¾îÁø ÈûÀº ºñ·Ê°ü°è°¡ ¼º¸³ÇÑ´Ù.ºñ·Ê°ü°è¸¦ µîÈ£°ü°è·Î ¸¸µé¾î ÁÖ±â À§Çؼ­ ºñ·Ê»ó¼ö°¡ »ç¿ëµÇ´Âµ¥ ÀÌ ºñ·Ê »ó¼ö°¡ °ü¼º Áú·®ÀÌ´Ù.
¢Ñ ¾î¶² ¹°Ã¼¿¡ ÀÛ¿ëÇÏ´Â ÈûÀÌ 1 ``rm nÀÏ ¶§, ¹°Ã¼¿¡ »ý±â´Â °¡¼Óµµ°¡ 1 ``rm m/s^2ÀÎ °æ¿ì, ±× ¹°Ã¼ÀÇ Áú·®À» 1 ``rm kgÀ¸·Î Á¤ÀÇÇÒ ¼ö ÀÖ´Ù.
5) ´ºÅÏÀÇ Á¦ 2¹ýÄ¢
-¹°Ã¼¿¡ ÀÛ¿ëÇÑ ¾ËÂ¥ÈûÀº ¹°Á¦ÀÇ Áú·®°ú °¡¼ÓµµÀÇ °ö°ú °°´Ù.
the net force on a body is equal to the product of the bodys mass and its acceleration.
-{vecf} {n et} m veca
-¹°Ã¼¿¡ ÀÛ¿ëÇÏ´Â Èû ¿ª½Ã º¤ÅÍÀ̹ǷΠxyzÁÂÇ¥°èÀÇ ¼¼ ¼ººÐÀ¸·Î ºÐÇØÇÒ ¼ö ÀÖ´Ù.   (ÀÌÇÏ »ý·«)

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