ÌâÄ¿ÄÚÈÝ
£¨10·Ö£©Ò»¸öµ×Ãæ´Ö²Ú¡¢ÖÊÁ¿ÎªMµÄÅü·ÅÔÚ´Ö²ÚµÄˮƽÃæÉÏ, ÅüÓëˮƽÃæµÄ¶¯Ä¦²ÁÒòÊý
£¬ÅüµÄбÃæ¹â»¬ÇÒÓëˮƽÃæ³É30¡ã½Ç;ÏÖÓÃÒ»¶Ë¹Ì¶¨µÄÇáÉþϵһÖÊÁ¿Îªm=
kgµÄСÇò,СÇò·ÅÔÚбÃæÉÏ,СÇò¾²Ö¹Ê±ÇáÉþÓëÊúÖ±·½ÏòµÄ¼Ð½ÇҲΪ30¡ã,ÈçͼËùʾ,
£¬ÊÔÇó:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006070359718.png)
(1)µ±Åü¾²Ö¹Ê±Éþ×ÓµÄÀÁ¦´óС.
(2)ÒÑÖªµØÃæ¶ÔÅüµÄ×î´ó¾²Ä¦²ÁÁ¦µÈÓÚµØÃæ¶ÔÅüµÄ»¬¶¯Ä¦²ÁÁ¦,Èô¸Ä±äСÇòµÄÖÊÁ¿£¬ÎªÊ¹Õû¸öϵͳ¾²Ö¹,ÔòСÇòÓëÅüµÄÖÊÁ¿Ó¦Âú×ãʲô¹Øϵ?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000607004572.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000607004339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000607019683.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006070359718.png)
(1)µ±Åü¾²Ö¹Ê±Éþ×ÓµÄÀÁ¦´óС.
(2)ÒÑÖªµØÃæ¶ÔÅüµÄ×î´ó¾²Ä¦²ÁÁ¦µÈÓÚµØÃæ¶ÔÅüµÄ»¬¶¯Ä¦²ÁÁ¦,Èô¸Ä±äСÇòµÄÖÊÁ¿£¬ÎªÊ¹Õû¸öϵͳ¾²Ö¹,ÔòСÇòÓëÅüµÄÖÊÁ¿Ó¦Âú×ãʲô¹Øϵ?
£¨1£©T=10N £¨2£©m
6M
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000607051227.png)
ÊÔÌâ·ÖÎö£º£¨1£©ÒÔСÇòΪÑо¿¶ÔÏó£¬ÆäÊÜÁ¦Çé¿öÈçͼ¼×Ëùʾ£¬
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006070667747.png)
¶ÔTºÍG½øÐÐÕý½»·Ö½â£¬ÓÉƽºâÌõ¼þ¿ÉµÃ£º
Tcos30¡ã=mgsin30¡ã (2·Ö)
ËùÒÔT=10N (2·Ö)
£¨2£©ÒÔÅüºÍСÇòÕûÌåΪÑо¿¶ÔÏó£¬ÕûÌåÊÜÁ¦Çé¿öÈçͼÒÒËùʾ£¬ÓÉÎïÌåµÄƽºâÌõ¼þ¿ÉµÃ£º
f=Tcos60¡ã (2·Ö)
ΪʹÕû¸öϵͳ¾²Ö¹£¬ÆäÁÙ½ç״̬ÊǾ²Ä¦²ÁÁ¦fΪ×î´óÖµ£¬¼´ÓÐ
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006070821134.png)
ËùÒÔÁªÁ¢ÒÔÉÏÁ½Ê½¿ÉµÃ£ºm=6M
¼´Ð¡ÇòÓëÅüµÄÖÊÁ¿Ó¦Âú×ãm
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000607051227.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿