ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬´Ö²Úˮƽ×ÀÃæPO³¤ÎªL=1m£¬×ÀÃæ¾àµØÃæ¸ß¶ÈH=O.2m£¬ÔÚ×ó¶ËPÕýÉÏ·½Ï¸ÉþÐü¹ÒÖÊÁ¿ÎªmµÄСÇòA£¬AÔÚ¾à×ÀÃæ¸ß¶Èh=0.8m´¦×ÔÓÉÊÍ·Å£¬Óë¾²Ö¹ÔÚ×ÀÃæ×ó¶ËÖÊÁ¿ÎªmµÄСÎï¿éB·¢Éú¶ÔÐÄÅöײ£¬Åöºó˲¼äСÇòAµÄËÙÂÊΪÅöǰ˲¼äµÄ
£¬·½ÏòÈÔÏòÓÒ£¬ÒÑ֪СÎï¿éBÓëˮƽ×ÀÃæPO¼ä¶¯Ä¦²ÁÒòÊý¦Ì=0.4£¬È¡ÖØÁ¦¼ÓËÙ¶Èg=10m/s2£®
£¨1£©ÇóÅöǰ˲¼äСÇòAµÄËÙÂʺÍÅöºó˲¼äСÎï¿éBµÄËÙÂÊ·Ö±ðΪ¶à´ó£»
£¨2£©ÇóСÎï¿éBÂäµØµãÓëOµãµÄˮƽ¾àÀ룮
1 | 4 |
£¨1£©ÇóÅöǰ˲¼äСÇòAµÄËÙÂʺÍÅöºó˲¼äСÎï¿éBµÄËÙÂÊ·Ö±ðΪ¶à´ó£»
£¨2£©ÇóСÎï¿éBÂäµØµãÓëOµãµÄˮƽ¾àÀ룮
·ÖÎö£º£¨1£©¸ù¾Ý»úеÄÜÊغ㶨ÂÉÇó³öСÇòAÅöײǰµÄËٶȣ¬ÔÙ¸ù¾Ý¶¯Á¿Êغ㶨ÂÉÇó³öÅöºó˲¼äСÎï¿éBµÄËٶȴóС£®
£¨2£©¸ù¾Ý¶¯Äܶ¨ÀíÇó³öСÎï¿éB»¬¶¯ÓÒ¶ËʱµÄËٶȣ¬À뿪ÓÒ¶Ë×öƽÅ×Ô˶¯£¬¸ù¾Ý¸ß¶ÈÇó³öʱ¼ä£¬¸ù¾Ýʱ¼äºÍ³õËÙ¶ÈÇó³öˮƽ¾àÀ룮
£¨2£©¸ù¾Ý¶¯Äܶ¨ÀíÇó³öСÎï¿éB»¬¶¯ÓÒ¶ËʱµÄËٶȣ¬À뿪ÓÒ¶Ë×öƽÅ×Ô˶¯£¬¸ù¾Ý¸ß¶ÈÇó³öʱ¼ä£¬¸ù¾Ýʱ¼äºÍ³õËÙ¶ÈÇó³öˮƽ¾àÀ룮
½â´ð£º½â£º£¨1£©ÉèÅöǰ˲¼äСÇòAµÄËٶȴóСΪv1£¬Åöºó˲¼äСÎï¿éBËٶȴóСΪv2
¶ÔСÇòA£¬ÓÉ»úÄÜÊغ㶨ÂÉ mgh=
m
v1=4m/s
¶Ôϵͳ£¬Óɶ¯Á¿Êغ㶨ÂÉmv1=m
+mv2
v2=3m/s
£¨2£©ÉèСÎï¿éBÓÉ×ÀÃæÓÒ¶ËOˮƽÅ׳öËٶȴóСΪv3£¬Óɶ¯Äܶ¨Àí£º-¦ÌmgL=
m
-
m
v3=1m/s
СÎï¿éBÓÉOˮƽÅ׳ö£¬ÊúÖ±·½Ïò£¬H=
gt2
t=0.2s
ˮƽ·½Ïò£¬x=v3t
x=0.2m
´ð£º£¨1£©Åöǰ˲¼äСÇòAµÄËÙÂʺÍÅöºó˲¼äСÎï¿éBµÄËÙÂÊ·Ö±ðΪ4m/s¡¢3m/s£®
£¨2£©Ð¡Îï¿éBÂäµØµãÓëOµãµÄˮƽ¾àÀëΪ0.2m£®
¶ÔСÇòA£¬ÓÉ»úÄÜÊغ㶨ÂÉ mgh=
1 |
2 |
v | 2 1 |
v1=4m/s
¶Ôϵͳ£¬Óɶ¯Á¿Êغ㶨ÂÉmv1=m
v1 |
4 |
v2=3m/s
£¨2£©ÉèСÎï¿éBÓÉ×ÀÃæÓÒ¶ËOˮƽÅ׳öËٶȴóСΪv3£¬Óɶ¯Äܶ¨Àí£º-¦ÌmgL=
1 |
2 |
v | 2 3 |
1 |
2 |
v | 2 2 |
v3=1m/s
СÎï¿éBÓÉOˮƽÅ׳ö£¬ÊúÖ±·½Ïò£¬H=
1 |
2 |
t=0.2s
ˮƽ·½Ïò£¬x=v3t
x=0.2m
´ð£º£¨1£©Åöǰ˲¼äСÇòAµÄËÙÂʺÍÅöºó˲¼äСÎï¿éBµÄËÙÂÊ·Ö±ðΪ4m/s¡¢3m/s£®
£¨2£©Ð¡Îï¿éBÂäµØµãÓëOµãµÄˮƽ¾àÀëΪ0.2m£®
µãÆÀ£º±¾Ìâ×ۺϿ¼²éÁ˶¯Äܶ¨Àí¡¢»úеÄÜÊغ㶨ÂÉÒÔ¼°¶¯Á¿Êغ㶨ÂÉ£¬×ÛºÏÐÔ½ÏÇ¿£¬¶ÔѧÉúµÄÄÜÁ¦ÒªÇó½Ï¸ß£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿