ÌâÄ¿ÄÚÈÝ
ÖÊÁ¿ÎªM=3kgµÄƽ°å³µ·ÅÔڹ⻬µÄˮƽÃæÉÏ£¬ÔÚƽ°å³µµÄ×î×ó¶ËÓÐһСÎï¿é£¨¿ÉÊÓΪÖʵ㣩£¬Îï¿éµÄÖÊÁ¿Îªm=1kg£¬Ð¡³µ×ó¶ËÉÏ·½ÈçͼËùʾ¹Ì¶¨×ÅÒ»ÕÏ°ÎïA£¬³õʼʱ£¬Æ½°å³µÓëÎï¿éÒ»ÆðÒÔˮƽËÙ¶Èv=2m/sÏò×óÔ˶¯£¬µ±Îï¿éÔ˶¯µ½ÕÏ°ÎïA´¦Ê±ÓëA·¢ÉúÎÞ»úеÄÜËðʧµÄÅöײ£¬¶øС³µ¿É¼ÌÐøÏò×óÔ˶¯£¬È¡ÖØÁ¦¼ÓËÙ¶Èg=10m/s2£®
£¨1£©Éèƽ°å³µ×ã¹»³¤£¬ÇóÎï¿éÓëÕÏ°ÎïµÚÒ»´ÎÅöײºó£¬Îï¿éÓëƽ°å³µËùÄÜ»ñµÃµÄ¹²Í¬ËÙÂÊ£»
£¨2£©Éèƽ°å³µ×ã¹»³¤£¬Îï¿éÓëÕÏ°ÎïµÚÒ»´ÎÅöºó£¬Îï¿éÏòÓÒÔ˶¯ËùÄÜ´ïµ½µÄ×î´ó¾àÀëÊÇs=0.4m£¬ÇóÎï¿éÓëƽ°å³µ¼äµÄ¶¯Ä¦²ÁÒòÊý£»
£¨3£©ÒªÊ¹Îï¿é²»»á´Óƽ°å³µÉÏ»¬Â䣬ƽ°å³µÖÁÉÙӦΪ¶à³¤£¿
£¨1£©Éèƽ°å³µ×ã¹»³¤£¬ÇóÎï¿éÓëÕÏ°ÎïµÚÒ»´ÎÅöײºó£¬Îï¿éÓëƽ°å³µËùÄÜ»ñµÃµÄ¹²Í¬ËÙÂÊ£»
£¨2£©Éèƽ°å³µ×ã¹»³¤£¬Îï¿éÓëÕÏ°ÎïµÚÒ»´ÎÅöºó£¬Îï¿éÏòÓÒÔ˶¯ËùÄÜ´ïµ½µÄ×î´ó¾àÀëÊÇs=0.4m£¬ÇóÎï¿éÓëƽ°å³µ¼äµÄ¶¯Ä¦²ÁÒòÊý£»
£¨3£©ÒªÊ¹Îï¿é²»»á´Óƽ°å³µÉÏ»¬Â䣬ƽ°å³µÖÁÉÙӦΪ¶à³¤£¿
·ÖÎö£º£¨1£©Îï¿éÓëÕÏ°ÎïÅöºóÎï¿éºÍС³µÏµÍ³¶¯Á¿Êغ㣬¸ù¾Ý¶¯Á¿Êغ㶨ÂÉÇó³öÎï¿éÓëƽ°å³µËùÄÜ»ñµÃµÄ¹²Í¬ËÙÂÊ£®
£¨2£©¶ÔÎï¿éÔËÓö¯Äܶ¨Àí£¬×¥×¡»¬¿é»¬µ½×îÓÒ¶ËËÙ¶ÈΪÁ㣬¸ù¾Ý¶¯Äܶ¨ÀíÇó³öÎï¿éÓëƽ°å³µ¼äµÄ¶¯Ä¦²ÁÒòÊý£®
£¨3£©Îï¿é¶à´ÎÓëÕÏ°ÎïÅöײºó£¬×îÖÕÓëƽ°å³µÍ¬Ê±Í£Ö¹£®¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉÇó³öƽ°å³µµÄÖÁÉÙ³¤¶È£®
£¨2£©¶ÔÎï¿éÔËÓö¯Äܶ¨Àí£¬×¥×¡»¬¿é»¬µ½×îÓÒ¶ËËÙ¶ÈΪÁ㣬¸ù¾Ý¶¯Äܶ¨ÀíÇó³öÎï¿éÓëƽ°å³µ¼äµÄ¶¯Ä¦²ÁÒòÊý£®
£¨3£©Îï¿é¶à´ÎÓëÕÏ°ÎïÅöײºó£¬×îÖÕÓëƽ°å³µÍ¬Ê±Í£Ö¹£®¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉÇó³öƽ°å³µµÄÖÁÉÙ³¤¶È£®
½â´ð£º½â£º£¨1£©Îï¿éÓëÕÏ°ÎïÅöºóÎï¿éºÍС³µÏµÍ³¶¯Á¿Êغ㣬¹ÊÓУº
Mv0-mv0=£¨M+m£©v¢Ù
´úÈëÊý¾ÝµÃv=1m/s ¢Ú
£¨2£©Îï¿éµÚÒ»´ÎÓëÕÏ°ÎïÅöºóÏòÓÒ¼õËÙµ½Á㣬ÏòÓÒÔ˶¯×îÔ¶
-¦Ìmgs=0-
mv02¢Û
´úÈëÊý¾ÝµÃ¦Ì=0.5 ¢Ü
£¨3£©Îï¿é¶à´ÎÓëÕÏ°ÎïÅöײºó£¬×îÖÕÓëƽ°å³µÍ¬Ê±Í£Ö¹£®
ÉèÎï¿éÔÚƽ°å³µÉÏÔ˶¯µÄ¾àÀëΪl£¬ÄÇôÓÉϵͳÄÜÁ¿ÊغãÓУº
¦Ìmgl=
(m+M)v02¢Ý
´úÈëÊý¾ÝµÃl=1.6m¢Þ
ËùÒÔҪʹµÃÎï¿é²»»¬³öƽ°å³µ£¬Æ½°å³µ³¤¶ÈÖÁÉÙΪ1.6m£®
´ð£º£¨1£©Îï¿éÓëÕÏ°ÎïµÚÒ»´ÎÅöײºó£¬Îï¿éÓëƽ°å³µËùÄÜ»ñµÃµÄ¹²Í¬ËÙÂÊΪ1m/s£®
£¨2£©Îï¿éÓëƽ°å³µ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ0.5£®
£¨3£©ÒªÊ¹Îï¿é²»»á´Óƽ°å³µÉÏ»¬Â䣬ƽ°å³µÖÁÉÙӦΪ1.6m£®
Mv0-mv0=£¨M+m£©v¢Ù
´úÈëÊý¾ÝµÃv=1m/s ¢Ú
£¨2£©Îï¿éµÚÒ»´ÎÓëÕÏ°ÎïÅöºóÏòÓÒ¼õËÙµ½Á㣬ÏòÓÒÔ˶¯×îÔ¶
-¦Ìmgs=0-
1 |
2 |
´úÈëÊý¾ÝµÃ¦Ì=0.5 ¢Ü
£¨3£©Îï¿é¶à´ÎÓëÕÏ°ÎïÅöײºó£¬×îÖÕÓëƽ°å³µÍ¬Ê±Í£Ö¹£®
ÉèÎï¿éÔÚƽ°å³µÉÏÔ˶¯µÄ¾àÀëΪl£¬ÄÇôÓÉϵͳÄÜÁ¿ÊغãÓУº
¦Ìmgl=
1 |
2 |
´úÈëÊý¾ÝµÃl=1.6m¢Þ
ËùÒÔҪʹµÃÎï¿é²»»¬³öƽ°å³µ£¬Æ½°å³µ³¤¶ÈÖÁÉÙΪ1.6m£®
´ð£º£¨1£©Îï¿éÓëÕÏ°ÎïµÚÒ»´ÎÅöײºó£¬Îï¿éÓëƽ°å³µËùÄÜ»ñµÃµÄ¹²Í¬ËÙÂÊΪ1m/s£®
£¨2£©Îï¿éÓëƽ°å³µ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ0.5£®
£¨3£©ÒªÊ¹Îï¿é²»»á´Óƽ°å³µÉÏ»¬Â䣬ƽ°å³µÖÁÉÙӦΪ1.6m£®
µãÆÀ£º±¾Ìâ×ۺϿ¼²éÁ˶¯Äܶ¨Àí¡¢¶¯Á¿Êغ㶨ÂɺÍÄÜÁ¿Êغ㶨ÂÉ£¬×ÛºÏÐÔ½ÏÇ¿£¬¶ÔѧÉúÄÜÁ¦ÒªÇó½Ï¸ß£¬Ðè¼ÓÇ¿Õâ·½ÃæµÄѵÁ·£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿