ÌâÄ¿ÄÚÈÝ
ÔÚ¡°Ì½¾¿¼ÓËÙ¶ÈÓëÁ¦¡¢ÖÊÁ¿µÄ¹Øϵ¡±µÄʵÑéÖУ¬²ÉÓÃÈçͼËùʾµÄ×°Öã®
£¨1£©±¾ÊµÑéÓ¦ÓõÄʵÑé·½·¨ÊÇ
A£®¿ØÖƱäÁ¿·¨ B£®¼ÙÉè·¨ C£®ÀíÏëʵÑé·¨
£¨2£©ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ
A£®ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÖÊÁ¿µÄ¹Øϵʱ£¬Ó¦¸Ä±äÀÁ¦¡¡µÄ´óС
B£®ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÍâÁ¦µÄ¹Øϵʱ£¬Ó¦¸Ã¸Ä±äС³µµÄÖÊÁ¿
C£®ÔÚ̽¾¿¼ÓËÙ¶ÈaÓëÖÊÁ¿mµÄ¹Øϵʱ£¬ÎªÁËÖ±¹ÛÅж϶þÕß¼äµÄ¹Øϵ£¬Ó¦×÷³öa-
ͼÏó
D£®µ±Ð¡³µµÄÖÊÁ¿Ô¶´óÓÚíÀÂëÅ̺ÍíÀÂëµÄ×ÜÖÊÁ¿Ê±£¬²ÅÄܽüËƵØÈÏΪϸÏ߶ÔС³µµÄÀÁ¦´óСµÈÓÚíÀÂëÅ̺ÍíÀÂëµÄ×ÜÖØÁ¦´óС£®
£¨1£©±¾ÊµÑéÓ¦ÓõÄʵÑé·½·¨ÊÇ
A
A
£»A£®¿ØÖƱäÁ¿·¨ B£®¼ÙÉè·¨ C£®ÀíÏëʵÑé·¨
£¨2£©ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ
C D
C D
£®A£®ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÖÊÁ¿µÄ¹Øϵʱ£¬Ó¦¸Ä±äÀÁ¦¡¡µÄ´óС
B£®ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÍâÁ¦µÄ¹Øϵʱ£¬Ó¦¸Ã¸Ä±äС³µµÄÖÊÁ¿
C£®ÔÚ̽¾¿¼ÓËÙ¶ÈaÓëÖÊÁ¿mµÄ¹Øϵʱ£¬ÎªÁËÖ±¹ÛÅж϶þÕß¼äµÄ¹Øϵ£¬Ó¦×÷³öa-
1 | m |
D£®µ±Ð¡³µµÄÖÊÁ¿Ô¶´óÓÚíÀÂëÅ̺ÍíÀÂëµÄ×ÜÖÊÁ¿Ê±£¬²ÅÄܽüËƵØÈÏΪϸÏ߶ÔС³µµÄÀÁ¦´óСµÈÓÚíÀÂëÅ̺ÍíÀÂëµÄ×ÜÖØÁ¦´óС£®
·ÖÎö£º£¨1£©ÓÉÓÚ¸ÃʵÑéÉæ¼°µÄÎïÀíÁ¿½Ï¶à£¬Òò´Ë¸ÃʵÑé²ÉÓõÄÊÇ¿ØÖƱäÁ¿·¨Ñо¿¼ÓËٶȡ¢ÖÊÁ¿¡¢ºÏÁ¦ÈýÕßÖ®¼äµÄ¹Øϵ£»
£¨2£©½â¾öʵÑéÎÊÌâÊ×ÏÈÒªÕÆÎÕ¸ÃʵÑéÔÀí£¬Á˽âʵÑéµÄ²Ù×÷²½ÖèºÍÊý¾Ý´¦ÀíÒÔ¼°×¢ÒâÊÂÏ
£¨2£©½â¾öʵÑéÎÊÌâÊ×ÏÈÒªÕÆÎÕ¸ÃʵÑéÔÀí£¬Á˽âʵÑéµÄ²Ù×÷²½ÖèºÍÊý¾Ý´¦ÀíÒÔ¼°×¢ÒâÊÂÏ
½â´ð£º½â£º£¨1£©¸ÃʵÑéÊÇ̽¾¿¼ÓËÙ¶ÈÓëÁ¦¡¢ÖÊÁ¿µÄÈýÕß¹Øϵ£¬Ñо¿ÈýÕß¹Øϵ±ØÐëÔËÓÿØÖƱäÁ¿·¨£¬¹ÊBC´íÎó£¬AÕýÈ·£®
¹ÊÑ¡A£®
£¨2£©A¡¢¸ÃʵÑé²ÉÓõÄÊÇ¿ØÖƱäÁ¿·¨Ñо¿£¬¼´±£³ÖÒ»¸öÁ¿²»±ä£¬Ñо¿ÆäËûÁ½¸öÁ¿Ö®¼äµÄ¹Øϵ£¬ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÖÊÁ¿µÄ¹Øϵʱ£¬Ó¦±£³ÖÀÁ¦µÄ´óС²»±ä£¬¹ÊA´íÎó£»
B¡¢ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÍâÁ¦µÄ¹Øϵʱ£¬Ó¦¸Ã±£³ÖС³µµÄÖÊÁ¿²»±ä£¬¹ÊB´íÎó£»
C¡¢ÒªÖ±¹ÛµÄ·´Ó³Á½¸öÁ¿Ö®¼äµÄ¹Øϵ£¬¿ÉÒÔͨ¹ý×÷ͼÀ´½â¾ö£®µ«ÊÇÖ»ÓÐ×÷³öÒ»ÌõÖ±Ïߣ¬²Å¿ÉÒÔÖ±¹ÛµÄ·´Ó³Á½¸ö±äÁ¿Ö®¼äµÄ¹Øϵ£®ÔÚ̽¾¿¼ÓËÙ¶ÈaÓëÖÊÁ¿mµÄ¹Øϵʱ£¬ÎªÁËÖ±¹ÛÅж϶þÕß¼äµÄ¹Øϵ£¬Ó¦×÷³öa-
ͼÏ󣬹ÊCÕýÈ·£»
D¡¢ÉèС³µµÄÖÊÁ¿ÎªM£¬íÀÂëÅ̺ÍíÀÂëµÄÖÊÁ¿Îªm£¬ÉèÉþ×ÓÉÏÀÁ¦ÎªF£¬¶ÔС³µ¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓУº
F=Ma ¢Ù
¶ÔÉ°Í°ºÍÉ°ÓУºmg-F=ma ¢Ú
F=
=
£¬ÓÉ´Ë¿ÉÖªµ±M£¾£¾Ê±£¬É°ºÍÉ°Í°µÄÖØÁ¦µÈÓÚÉþ×ÓµÄÀÁ¦£¬¹ÊDÕýÈ·£®
¹ÊÑ¡CD£®
¹ÊÑ¡A£®
£¨2£©A¡¢¸ÃʵÑé²ÉÓõÄÊÇ¿ØÖƱäÁ¿·¨Ñо¿£¬¼´±£³ÖÒ»¸öÁ¿²»±ä£¬Ñо¿ÆäËûÁ½¸öÁ¿Ö®¼äµÄ¹Øϵ£¬ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÖÊÁ¿µÄ¹Øϵʱ£¬Ó¦±£³ÖÀÁ¦µÄ´óС²»±ä£¬¹ÊA´íÎó£»
B¡¢ÔÚ̽¾¿¼ÓËÙ¶ÈÓëÍâÁ¦µÄ¹Øϵʱ£¬Ó¦¸Ã±£³ÖС³µµÄÖÊÁ¿²»±ä£¬¹ÊB´íÎó£»
C¡¢ÒªÖ±¹ÛµÄ·´Ó³Á½¸öÁ¿Ö®¼äµÄ¹Øϵ£¬¿ÉÒÔͨ¹ý×÷ͼÀ´½â¾ö£®µ«ÊÇÖ»ÓÐ×÷³öÒ»ÌõÖ±Ïߣ¬²Å¿ÉÒÔÖ±¹ÛµÄ·´Ó³Á½¸ö±äÁ¿Ö®¼äµÄ¹Øϵ£®ÔÚ̽¾¿¼ÓËÙ¶ÈaÓëÖÊÁ¿mµÄ¹Øϵʱ£¬ÎªÁËÖ±¹ÛÅж϶þÕß¼äµÄ¹Øϵ£¬Ó¦×÷³öa-
1 |
m |
D¡¢ÉèС³µµÄÖÊÁ¿ÎªM£¬íÀÂëÅ̺ÍíÀÂëµÄÖÊÁ¿Îªm£¬ÉèÉþ×ÓÉÏÀÁ¦ÎªF£¬¶ÔС³µ¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓУº
F=Ma ¢Ù
¶ÔÉ°Í°ºÍÉ°ÓУºmg-F=ma ¢Ú
F=
mgM |
M+m |
mg | ||
1+
|
¹ÊÑ¡CD£®
µãÆÀ£º½â¾öʵÑéÎÊÌâÊ×ÏÈÒªÕÆÎÕ¸ÃʵÑéÔÀí£¬Á˽âʵÑéµÄ²Ù×÷²½ÖèºÍÊý¾Ý´¦ÀíÒÔ¼°×¢ÒâÊÂÏȻºóÊìÁ·Ó¦ÓÃÎïÀí¹æÂÉÀ´½â¾öʵÑéÎÊÌ⣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿