ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬ÔÚÇã½Ç¦È£½30ºµÄбÃæÉÏ·ÅÖÃÒ»¶Î°¼²ÛB£¬BÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì£½
£¬²ÛÄÚ¿¿½üÓÒ²à±Ú´¦ÓÐһСÎï¿éA(¿ÉÊÓΪÖʵã)£¬Ëüµ½°¼²Û×ó²à±ÚµÄ¾àÀë
d£½0.10m¡£A¡¢BµÄÖÊÁ¿¶¼Îªm=2.0kg£¬BÓëбÃæ¼äµÄ×î´ó¾²Ä¦²ÁÁ¦¿ÉÈÏΪµÈÓÚ»¬¶¯Ä¦²ÁÁ¦£¬²»¼ÆA¡¢BÖ®¼äµÄĦ²Á£¬Ð±Ãæ×ã¹»³¤¡£ÏÖͬʱÓɾ²Ö¹ÊÍ·ÅA¡¢B£¬¾¹ýÒ»¶Îʱ¼ä£¬AÓëBµÄ²à±Ú·¢ÉúÅöײ£¬Åöײ¹ý³Ì²»¼Æ»úеÄÜËðʧ£¬Åöײʱ¼ä¼«¶Ì¡£È¡g=10m/s2¡£Çó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241956057523533.png)
£¨1£©»³ö°¼²ÛBÔ˶¯µÄËÙ¶ÈvËæʱ¼ätµÄ±ä»¯Í¼Ïó£»
£¨2£©Îï¿éAÓë°¼²ÛBµÄ×ó²à±ÚµÚn´ÎÅöײºó˲¼äA¡¢BµÄËٶȴóС£»
£¨3£©´Ó³õʼλÖõ½Îï¿éAÓë°¼²ÛBµÄ×ó²à±Ú·¢ÉúµÚn´ÎÅöײʱBµÄλÒÆ´óС¡£
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195604769470.png)
d£½0.10m¡£A¡¢BµÄÖÊÁ¿¶¼Îªm=2.0kg£¬BÓëбÃæ¼äµÄ×î´ó¾²Ä¦²ÁÁ¦¿ÉÈÏΪµÈÓÚ»¬¶¯Ä¦²ÁÁ¦£¬²»¼ÆA¡¢BÖ®¼äµÄĦ²Á£¬Ð±Ãæ×ã¹»³¤¡£ÏÖͬʱÓɾ²Ö¹ÊÍ·ÅA¡¢B£¬¾¹ýÒ»¶Îʱ¼ä£¬AÓëBµÄ²à±Ú·¢ÉúÅöײ£¬Åöײ¹ý³Ì²»¼Æ»úеÄÜËðʧ£¬Åöײʱ¼ä¼«¶Ì¡£È¡g=10m/s2¡£Çó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241956057523533.png)
£¨1£©»³ö°¼²ÛBÔ˶¯µÄËÙ¶ÈvËæʱ¼ätµÄ±ä»¯Í¼Ïó£»
£¨2£©Îï¿éAÓë°¼²ÛBµÄ×ó²à±ÚµÚn´ÎÅöײºó˲¼äA¡¢BµÄËٶȴóС£»
£¨3£©´Ó³õʼλÖõ½Îï¿éAÓë°¼²ÛBµÄ×ó²à±Ú·¢ÉúµÚn´ÎÅöײʱBµÄλÒÆ´óС¡£
£¨1£©£¨2£©vAn=(n-1)m?s-1£¬vBn="n" m?s-1£¨3£©xn×Ü=0.2n2m
ÊÔÌâ·ÖÎö£º£º£¨1£©²ÛËùÊܵÄ×î´ó¾²Ä¦²ÁÁ¦µÈÓÚÖØÁ¦ÑØбÃæµÄ·ÖÁ¦£¬ËùÒÔÎï¿éÊͷź󣬲۴¦ÓÚ¾²Ö¹£¬Îï¿é×öÔȼÓËÙÖ±ÏßÔ˶¯£¬¸ù¾ÝλÒÆʱ¼ä¹«Ê½Çó³öСÇòÓë²Û±ÚµÚÒ»´Î·¢ÉúÅöײʱËùÐèµÄʱ¼ä£®
£¨2£©Îï¿éºÍ²Û·¢ÉúÅöײµÄÇ°ºó˲¼ä£¬¶¯Á¿Êغ㣬ÄÜÁ¿Êغ㣬¸ù¾Ý¶¯Á¿Êغ㶨ÂɺÍÄÜÁ¿Êغ㶨ÂÉÇó³ö²ÛºÍСÇòµÄËٶȣ®
£¨3£©µÚÒ»´ÎÅöײºó£¬²Û×öÔÈËÙÔ˶¯£¬Îï¿é×öÔȼÓËÙÔ˶¯£¬ÔÚÔ˶¯µÄ¹ý³ÌÖУ¬¿ªÊ¼Ê±²ÛµÄËٶȴóÓÚÇòµÄËٶȣ¬Îï¿éÓëA±ÚµÄ¾àÀëÔ½À´Ô½´ó£¬ËÙ¶ÈÏàµÈʱ£¬Îï¿éµ½²à±ÚBµÄ¾àÀë×î´ó£¬ÅжϴËʱÊÇ·ñÓëA±ÚÏàÅö£¬ÈôûÏàÅö£¬´ËºóµÄÎï¿éÓëA±ÚµÄ¾àÀëÔ½À´Ô½Ð¡£¬×¥×¡Î»ÒÆÏàµÈ£¬Çó³ö×·¼°µÄʱ¼ä£®
½â£º£¨1£©AÔÚ°¼²ÛÄÚ£¬BÊܵ½µÄ»¬¶¯Ä¦²ÁÁ¦
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241956061421012.png)
BËùÊÜÖØÁ¦ÑØбÃæµÄ·ÖÁ¦
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195606907937.png)
ÒòΪ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195607593475.png)
ÊÍ·ÅAºó£¬A×öÔȼÓËÙÔ˶¯£¬ÓÉÅ£¶Ù¶¨ÂɺÍÔ˶¯Ñ§¹æÂɵÃ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195607967731.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195608498642.png)
½âµÃAµÄ¼ÓËٶȺÍÅöײǰµÄËٶȷֱðΪ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195609137840.png)
B·¢ÉúÅöײʱÔ˶¯µÄʱ¼ä£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195609871743.png)
¶¯Á¿Êغã
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195610573679.png)
Åöײ¹ý³Ì²»Ëðʧ»úеÄÜ£¬µÃ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195611259952.png)
½âµÃµÚÒ»´Î·¢ÉúÅöײºó˲¼äA¡¢BµÄËٶȷֱð
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195611945791.png)
Ö®ºóBÔÈËÙÔ˶¯£¬A¼ÓËÙÔ˶¯£¬A¡¢BµÚÒ»´ÎÅöײºó£¬B×öÔÈËÙÔ˶¯
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195612632476.png)
A×öÔȼÓËÙÔ˶¯£¬¼ÓËÙ¶ÈÈÔΪa1
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195613225684.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195614036525.png)
¾¹ýʱ¼ät1£¬AµÄËÙ¶ÈÓëBÏàµÈ£¬AÓëBµÄ×ó²à±Ú¾àÀë´ïµ½×î´ó£¬¼´
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195614301547.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195614894461.png)
´úÈëÊý¾Ý½âµÃAÓëB×ó²à±ÚµÄ¾àÀë
s=0.10m ?
ÒòΪs=d£¬ AÇ¡ºÃÔ˶¯µ½BµÄÓÒ²à±Ú£¬¶øÇÒËÙ¶ÈÏàµÈ£¬ËùÒÔAÓëBµÄÓÒ²à±ÚÇ¡ºÃ½Ó
´¥µ«Ã»Óз¢ÉúÅöײ¡£ÔÙ´ÎÏàÅöµÄʱ¼äΪ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195615440722.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195615986665.png)
¶¯Á¿Êغã
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195616594737.png)
Åöײ¹ý³Ì²»Ëðʧ»úеÄÜ£¬µÃ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241956171251173.png)
½âµÃ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195617733866.png)
ͬÀí¿ÉÒÔÇó³ö£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195618357874.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082419561888711042.png)
£¨2£©ÓÉÒÔÉÏ·ÖÎö¿ÉÖª£ºÎï¿éAÓë°¼²ÛBµÄ×ó²à±ÚµÚn´ÎÅöײºó˲¼äA¡¢BµÄËٶȴóС·Ö±ðΪ£ºvAn=(n-1)m?s-1£¬vBn="n" m?s-1
£¨3£©ÓÉÒÔÉÏ·ÖÎö¿ÉÖª£º´Ó³õʼλÖõ½Îï¿éAÓë°¼²ÛBµÄ×ó²à±Ú·¢ÉúµÚn´ÎÅöײʱBµÄλÒÆ´óС£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195619153686.png)
µãÆÀ£º±¾ÌâÄѶȽϴó, ±¾Ìâ×ÛºÏÔËÓÃÁËÅ£¶ÙµÚ¶þ¶¨ÂÉ¡¢¶¯Á¿Êغ㶨ÂɺÍÄÜÁ¿Êغ㶨ÂÉ£¬×ÛºÏÐÔ½ÏÇ¿£¬¹Ø¼üÊÇÀíÇåÇòÓë²ÛµÄÔ˶¯Çé¿ö£¬Ñ¡ÔñºÏÊʵĹæÂɽøÐÐÇó½â,¶ÔÔ˶¯¹ý³ÌµÄ°ÑÎÕҪǿ,Ñ¡ÔñºÏÊʵÄ֪ʶµãÇó½âÒ²·Ç³£¹Ø¼ü
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿