ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬Ôڹ⻬ˮƽ×ÀÃæÉÏ·ÅÓг¤Ä¾°å£¬µÄÓÒ¶ËÓй̶¨µ²°å£¬Ä¾°åµÄ³¤¶ÈΪ¡£ÁíÓÐСÎï¿éºÍ¿ÉÒÔÔÚ³¤Ä¾°åÉÏ»¬¶¯£¬Ö®¼äºÍÖ®¼äµÄ¶¯Ä¦²ÁÒòÊýÏàͬ£¬Ö®¼äºÍÖ®¼äµÄ×î´ó¾²Ä¦²ÁÁ¦µÈÓÚ»¬¶¯Ä¦²ÁÁ¦¡£µÄ³ß´çÒÔ¼°µÄºñ¶È½Ô¿ÉºöÂÔ²»¼Æ£¬£¨Á¬Í¬µ²°å£©µÄÖÊÁ¿½ÔΪ¡££¨1£©Èô±»¹Ì¶¨ÔÚ×ÀÃæÉÏ£¬¾²Ö¹·ÅÔÚľ°åµÄÖÐÑ룬ÒÔ³õËٶȴÓ×ó¶Ë³åÉÏľ°å£¬Îï¿é¸ÕºÃÄÜÅöµ½£¬ÇóÖ®¼äµÄ¶¯Ä¦²ÁÒòÊý£»£¨2£©Èôδ±»¹Ì¶¨ÔÚ×ÀÃæÉÏ£¬¿ªÊ¼Ê±¾²Ö¹·ÅÔÚľ°åµÄÖÐÑ룬ÒÔ³õËٶȴÓ×ó¶Ë³åÉÏľ°å¡£a.ҪʹÎï¿éÓëÄÜÏàÅö£¬³õËÙ¶ÈÓ¦Âú×ãµÄÌõ¼þÊÇʲô£¿b.ÈôÎï¿éÓë·¢ÉúÅöײ¹ý³ÌµÄʱ¼ä¼«¶Ì£¬ÇÒÅöײ¹ý³ÌÖÐûÓлúеÄÜËðʧ£¬ÒªÊ¹Îï¿éÄܹ»Óëµ²°å·¢ÉúÅöײ£¬³õËÙ¶ÈÓ¦Âú×ãµÄÌõ¼þÊÇʲô£¿
£¨1£©£¬£¨2£©£¬
£¨1£©C±»¹Ì¶¨×¡£¬ÔòAÔÚĦ²ÁÁ¦µÄ×÷ÓÃϼõËÙÔ˶¯µ½Bµã£¬¸ÕºÃÅöµ½BµÄÌõ¼þÊÇ´ïµ½BµãAËÙ¶ÈΪÁ㣬¼´£¬µÃ
£¨2£©a¡¢ÒªÊ¹Îï¿éA¸ÕºÃÓëÎï¿éB·¢ÉúÅöײ£¬Îï¿éAÔ˶¯µ½Îï¿éB´¦Ê±£¬A¡¢BµÄËÙ¶ÈÏàµÈ£¬
¼´v1=-¦Ìgt=¦Ìgt £¬µÃv1=
Éèľ°åCÔڴ˹ý³ÌÖеÄλÒÆΪx1£¬ÔòÎï¿éAµÄλÒÆΪx1+L£¬Óɶ¯Äܶ¨Àí?
-¦Ìmg£¨x1+L£©=mv12-m2
¦Ìmgx1=£¨2m£©v12
ÁªÁ¢ÉÏÊö¸÷ʽ½âµÃ£¬ÒªÊ¹Îï¿éA¡¢B·¢ÉúÏàÅöµÄÌõ¼þÊÇ
b¡¢ÒòΪABÅöײ¹ý³ÌÖÐûÓлúеÄܵÄËðʧ£¬ÇÒÁ½Îï¿éÍêÈ«Ïàͬ£¬ËùÒÔÅöײʱ½»»»Ëٶȣ¬¾ÍºÃÏñÊÇAÒ»Ö±¼õËÙÔ˶¯µ½µ²°åPÒ»Ñù£¬ÇҸպ÷¢ÉúÅöײʱ£¬BCËÙ¶ÈÏàµÈ
¼´v2=-¦Ìgt=¦Ìgt £¬µÃv2=
Éèľ°åCÔڴ˹ý³ÌÖеÄλÒÆΪx2£¬ÔòÎï¿éABµÄλÒÆÖ®ºÍΪx2+2L£¬Óɶ¯Äܶ¨Àí?
-¦Ìmg£¨x2+2L£©=mv22-m2
¦Ìmgx2=£¨2m£©v22
ÁªÁ¢ÉÏÊö¸÷ʽ½âµÃ£¬ÒªÊ¹Îï¿éBÓëµ²°å·¢ÉúÏàÅöµÄÌõ¼þÊÇ
¹Ê´ð°¸Îª£º£¨1£©£¬£¨2£©£¬
£¨2£©a¡¢ÒªÊ¹Îï¿éA¸ÕºÃÓëÎï¿éB·¢ÉúÅöײ£¬Îï¿éAÔ˶¯µ½Îï¿éB´¦Ê±£¬A¡¢BµÄËÙ¶ÈÏàµÈ£¬
¼´v1=-¦Ìgt=¦Ìgt £¬µÃv1=
Éèľ°åCÔڴ˹ý³ÌÖеÄλÒÆΪx1£¬ÔòÎï¿éAµÄλÒÆΪx1+L£¬Óɶ¯Äܶ¨Àí?
-¦Ìmg£¨x1+L£©=mv12-m2
¦Ìmgx1=£¨2m£©v12
ÁªÁ¢ÉÏÊö¸÷ʽ½âµÃ£¬ÒªÊ¹Îï¿éA¡¢B·¢ÉúÏàÅöµÄÌõ¼þÊÇ
b¡¢ÒòΪABÅöײ¹ý³ÌÖÐûÓлúеÄܵÄËðʧ£¬ÇÒÁ½Îï¿éÍêÈ«Ïàͬ£¬ËùÒÔÅöײʱ½»»»Ëٶȣ¬¾ÍºÃÏñÊÇAÒ»Ö±¼õËÙÔ˶¯µ½µ²°åPÒ»Ñù£¬ÇҸպ÷¢ÉúÅöײʱ£¬BCËÙ¶ÈÏàµÈ
¼´v2=-¦Ìgt=¦Ìgt £¬µÃv2=
Éèľ°åCÔڴ˹ý³ÌÖеÄλÒÆΪx2£¬ÔòÎï¿éABµÄλÒÆÖ®ºÍΪx2+2L£¬Óɶ¯Äܶ¨Àí?
-¦Ìmg£¨x2+2L£©=mv22-m2
¦Ìmgx2=£¨2m£©v22
ÁªÁ¢ÉÏÊö¸÷ʽ½âµÃ£¬ÒªÊ¹Îï¿éBÓëµ²°å·¢ÉúÏàÅöµÄÌõ¼þÊÇ
¹Ê´ð°¸Îª£º£¨1£©£¬£¨2£©£¬
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿