ÌâÄ¿ÄÚÈÝ
13£®ÈçͼËùʾ£¬ÔÚÇã½ÇΪ¦ÈµÄ¹â»¬Ð±ÃæÄ©¶Ë¹Ì¶¨×ÅÒ»¸ö×ã¹»³¤µÄµ¼ÈÈÆû¸×£¬Æû¸×ÀïÓûîÈû·â±Õ×ÅÒ»¶¨ÖÊÁ¿µÄÀíÏëÆøÌ壬»îÈûµÄÖÊÁ¿Îªm£¬ºá½ØÃæ»ýΪS£¬»îÈûµ½¸×µ×µÄ¾àÀëΪd£¬ÏÖ°ÑÒ»¸ö´øÓÐÇá¸ËµÄÎïÌå·ÅÔÚбÃæÉÏ£¬Çá¸ËÓëбÃæƽÐУ¬Çá¸Ë϶˷ÅÔÚ»îÈûÉÏ£®ÒÑÖªÎïÌåÖÊÁ¿ÎªM£¬´óÆøѹǿΪP0£®ÖØÁ¦¼ÓËÙ¶ÈΪg£¬»îÈûÔÚÔ˶¯¹ý³ÌÖÐËùÊܵÄĦ²ÁÁ¦¿ÉÒÔºöÂÔ²»¼Æ£¬»·¾³Î¶ȱ£³Ö²»±ä£¬Ç󣺢ٸÕÊÍ·ÅÎïÌåµÄ˲¼ä£¬ÎïÌåµÄ¼ÓËٶȴóС£»
¢ÚÎȶ¨ºó£¬»îÈûµ½Æû¸×µ×ÃæµÄ¾àÀ룮
·ÖÎö ¢Ù¸ÕÊÍ·ÅÎïÌåµÄ˲¼ä£¬ÎïÌåÓë»îÈûµÄ¼ÓËÙ¶ÈÏàͬ£¬ÓÉÎïÌåºÍ»îÈûÕûÌ壬ÔËÓÃÅ£¶ÙµÚ¶þ¶¨ÂÉÇó¼ÓËٶȵĴóС£»
¢Ú×îÖÕ»îÈûÍ£Ö¹Ô˶¯£¬¸ù¾ÝÁ¦µÄƽºâÌõ¼þÇó³ö·â±ÕÆøÌåµÄѹǿ£¬ÔÙÓɲ£Òâ¶ú¶¨ÂÉÇó»îÈûµ½Æû¸×µ×ÃæµÄ¾àÀ룮
½â´ð ½â£º¢Ù¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÎïÌåÊͷŵÄ˲¼ä£¬ÓÐ
Mgsin¦È=£¨M+m£©a
½âµÃ¼ÓËÙ¶È a=$\frac{Mgsin¦È}{M+m}$
¢Ú×îÖÕ»îÈûÍ£Ö¹Ô˶¯£¬¸ù¾ÝÁ¦µÄƽºâÌõ¼þÓÐ
£¨m+M£©gsin¦È+p0S-p2S=0
ÆøÌåζȲ»±ä£¬¸ù¾Ý²£Òâ¶ú¶¨ÂÉÓÐ
p1ds=p2d'S£¬
ÆäÖÐ p1S=mgsin¦È+p0S
ÁªÁ¢½âµÃ»îÈûµ½Æû¸×µ×µÄ¾àÀë d¡ä=$\frac{{p}_{0}S+mgsin¦È}{£¨m+M£©gsin¦È+{p}_{0}S}d$
´ð£º
¢Ù¸ÕÊÍ·ÅÎïÌåµÄ˲¼ä£¬ÎïÌåµÄ¼ÓËٶȴóСÊÇ$\frac{Mgsin¦È}{M+m}$£»
¢ÚÎȶ¨ºó£¬»îÈûµ½Æû¸×µ×ÃæµÄ¾àÀëÊÇ$\frac{{p}_{0}S+mgsin¦È}{£¨m+M£©gsin¦È+{p}_{0}S}d$£®
µãÆÀ ¸ù¾ÝƽºâÌõ¼þÇó·â±ÕÆøÌåµÄѹǿÊǽâ¾ö±¾ÌâµÄ¹Ø¼ü£®¶ÔÓÚÆøÌ壬ҪÉÆÓÚ·ÖÎöÆøÌåµÄ״̬£¬×¥×¡²»±äÁ¿£¬ÕÒ׼״̬·½³Ì£®
A£® | v-v0 | B£® | v+v0 | C£® | $\sqrt{{v}^{2}+{{v}_{0}}^{2}}$ | D£® | $\sqrt{{v}^{2}-{{v}_{0}}^{2}}$ |
A£® | ·¨ÀµÚ¾¹ýÊ®ÓàÄêµÄ²»Ð¸Ñо¿£¬·¢ÏÖÁ˵ç´Å¸ÐÓ¦ÏÖÏó¼°Æä×ñѵĹæÂÉ-·¨ÀµÚµç´Å¸ÐÓ¦¶¨ÂÉ | |
B£® | ¹âµçЧÏÖÏóºÍ¿µÆÕ¶ÙЧӦ¶¼±íÃ÷¹â¾ßÓÐÁ£×ÓÐÔ | |
C£® | ²£¶û½«Á¿×Ó¹ÛÄîÒýÈëÔ×ÓÁìÓò£¬ÆäÀíÂÛÄܹ»½âÊÍËùÓÐÔ×Ó¹âÆ×µÄÌØÕ÷ | |
D£® | ¾ÓÀï·ò¸¾·¢ÏÖÁËÌìÈ»·ÅÉäÏÖÏó£¬ÌìÈ»·ÅÉäÏÖÏó±íÃ÷Ô×Ӻ˾ßÓи´ÔӵĽṹ |
A£® | ·É´¬ÏÈÔڱȿռäʵÑéÊҰ뾶СµÄ¹ìµÀÉϼÓËÙ£¬¼ÓËÙºó·É´¬Ö𽥿¿½ü¿Õ¼äʵÑéÊÒ£¬Á½ÕßËٶȽӽüʵÏÖ¶Ô½Ó | |
B£® | ʹ·É´¬Óë¿Õ¼äʵÑéÊÒÔÚͬһ¹ìµÀÉÏÔËÐУ¬È»ºó¿Õ¼äʵÑéÊÒ¼õËٵȴý·É´¬ÊµÏÖ¶Ô½Ó | |
C£® | ¼ÙÉèÁ½Õ߶ԽӺóÔÚͬһ¹ìµÀÉÏ×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÔÚÒ»¶Îʱ¼ä¡÷tÄÚ£¨¡÷t¡ú0£©Ëٶȱ仯¡÷vµÄ·½ÏòÓë¹ìµÀ°ë¾¶´¹Ö± | |
D£® | ¼ÙÉèÁ½Õ߶ԽӺóÔÚͬһ¹ìµÀÉÏ×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÔÚÒ»¶Îʱ¼ä¡÷tÄÚ£¨¡÷t¡ú0£©Ëٶȱ仯¡÷vµÄ·½ÏòÓɵØÇòÇòÐÄÖ¸Ïò·É´¬ |