ÌâÄ¿ÄÚÈÝ
![](http://thumb.1010pic.com/pic3/upload/images/201307/40/95247508.png)
£¨1£©Á½»¬¿éÔÚÅöײǰµÄ˲ʱ£¬»¬¿éAµÄËٶȣ»
£¨2£©»¬¿éAÆðʼÔ˶¯Î»ÖÃÓ뻬¿éBµÄ¾àÀë?£»
£¨3£©B»¬¿é±»µ¯»Éµ¯¿ªºó¾àÊúֱǽµÄ×î´ó¾àÀësm£®
·ÖÎö£º£¨1£©A¡¢BÁ½»¬¿éÅöײ¹ý³Ì¶¯Á¿Êغ㣬ÒÑÖªÅöºóµÄ¹²Í¬Ëٶȣ¬¸ù¾Ý¶¯Á¿Êغ㶨Âɼ´¿ÉÇóµÃÅöÇ°AµÄËٶȣ®
£¨2£©¶ÔÓÚÅöÇ°AÏò×óÔȼÓËÙÔ˶¯¹ý³Ì£¬ÔËÓö¯Äܶ¨Àí¿ÉÇó³öl£®
£¨3£©ÅöºóA¡¢BÒ»ÆðѹËõµ¯»ÉÖÁ×î¶Ì£¬É赯»ÉѹËõÁ¿Îªx1£¬Óɶ¯Äܶ¨Àí¼´¿ÉÇóµÃµ¯»ÉѹËõÁ¿£¬µ¯»ÉѹËõ¹ý³ÌÖе糡Á¦×öÕý¹¦£¬µçÊÆÄܵļõÉÙÁ¿µÈÓڵ糡Á¦Ëù×öµÄ¹¦£»Éè·´µ¯ºóA¡¢B»¬ÐÐÁËx2¾àÀëºóËٶȼõΪÁ㣬Óɶ¯Äܶ¨ÀíÇóµÃx2£¬±È½Ïµç³¡Á¦Ó뻬¶¯Ä¦²ÁÁ¦µÄ¹Øϵ£¬Åжϻ¬¿éµÄÔ˶¯Çé¿ö£¬×îÖÕÇó³ö×î´ó¾àÀ룮
£¨2£©¶ÔÓÚÅöÇ°AÏò×óÔȼÓËÙÔ˶¯¹ý³Ì£¬ÔËÓö¯Äܶ¨Àí¿ÉÇó³öl£®
£¨3£©ÅöºóA¡¢BÒ»ÆðѹËõµ¯»ÉÖÁ×î¶Ì£¬É赯»ÉѹËõÁ¿Îªx1£¬Óɶ¯Äܶ¨Àí¼´¿ÉÇóµÃµ¯»ÉѹËõÁ¿£¬µ¯»ÉѹËõ¹ý³ÌÖе糡Á¦×öÕý¹¦£¬µçÊÆÄܵļõÉÙÁ¿µÈÓڵ糡Á¦Ëù×öµÄ¹¦£»Éè·´µ¯ºóA¡¢B»¬ÐÐÁËx2¾àÀëºóËٶȼõΪÁ㣬Óɶ¯Äܶ¨ÀíÇóµÃx2£¬±È½Ïµç³¡Á¦Ó뻬¶¯Ä¦²ÁÁ¦µÄ¹Øϵ£¬Åжϻ¬¿éµÄÔ˶¯Çé¿ö£¬×îÖÕÇó³ö×î´ó¾àÀ룮
½â´ð£º½â£º£¨1£©ÉèAÓëBÅöײǰAµÄËÙ¶ÈΪv1£¬Åöײ¹ý³Ì¶¯Á¿Êغ㣬ÓУº
mv1=£¨M+m£©v
´úÈëÊý¾Ý½âµÃ£ºv1=3m/s
£¨2£©¶ÔA£¬´Ó¿ªÊ¼Ô˶¯ÖÁÅöײB֮ǰ£¬¸ù¾Ý¶¯Äܶ¨Àí£¬ÓУº
qE?-¦Ìmg?=
mv 1 2-0
´úÈëÊý¾Ý½âµÃ£º?=0.3m¡¡
£¨3£©É赯»É±»Ñ¹ËõÖÁ×î¶ÌʱµÄѹËõÁ¿Îªs1£¬¶ÔABÕûÌ壬´ÓÅöºóÖÁµ¯»ÉѹËõ×î¶Ì¹ý³ÌÖУ¬¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉ£¬ÓУº
qEs1+
(M+m)v 2=¦Ìmg s1+E0¡¡¡¡
´úÈëÊý¾Ý½âµÃ£ºs1=0.02m¡¡
É赯»ÉµÚÒ»´Î»Ö¸´µ½Ô³¤Ê±£¬AB¹²Í¬¶¯ÄÜΪEk£¬¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉ£¬ÓУº
E0=qEs1+¦Ì£¨M+m£©g s1+Ek ¢Ù
ÔÚµ¯»É°ÑBAÍùÓÒÍƳöµÄ¹ý³ÌÖУ¬ÓÉÓÚBÊܵ½Ïò×óµÄĦ²ÁÁ¦Ð¡ÓÚAÊܵ½µÄÏò×óµÄĦ²ÁÁ¦ºÍµç³¡Á¦Ö®ºÍ£®¹ÊÖÁËûÃÇֹ֮ͣǰ£¬Á½ÕßûÓзֿª£®
µ¯»ÉµÚÒ»´Î½«ABµ¯³öÖÁÁ½Õßͬʱͬ´¦Í£Ö¹Ê±£¬B¾àÀëÊúֱǽ±Ú×îÔ¶£¬Éè´Ëʱ¾àÀ뵯»ÉÔ³¤´¦Îªs2£¬¸ù¾Ý¶¯Äܶ¨Àí£¬ÓУº
-qEs2-¦Ì£¨M+m£©g s2=0-Ek ¢Ú
¢Ù¢ÚÁªÁ¢²¢´úÈëÊý¾Ý½âµÃ£ºs2=0.03m
¹ÊBÀëǽ±ÚµÄ×î´ó¾àÀësm=s+s2=0.08m
´ð£º
¡¡£¨1£©Á½»¬¿éÔÚÅöײǰµÄ˲ʱ£¬»¬¿éAµÄËÙ¶ÈΪ3m/s£®
£¨2£©»¬¿éAÆðʼÔ˶¯Î»ÖÃÓ뻬¿éBµÄ¾àÀë?Ϊ0.3m£®
£¨3£©B»¬¿é±»µ¯»Éµ¯¿ªºó¾àÊúֱǽµÄ×î´ó¾àÀësmΪ0.08m£®
mv1=£¨M+m£©v
´úÈëÊý¾Ý½âµÃ£ºv1=3m/s
£¨2£©¶ÔA£¬´Ó¿ªÊ¼Ô˶¯ÖÁÅöײB֮ǰ£¬¸ù¾Ý¶¯Äܶ¨Àí£¬ÓУº
qE?-¦Ìmg?=
1 |
2 |
´úÈëÊý¾Ý½âµÃ£º?=0.3m¡¡
£¨3£©É赯»É±»Ñ¹ËõÖÁ×î¶ÌʱµÄѹËõÁ¿Îªs1£¬¶ÔABÕûÌ壬´ÓÅöºóÖÁµ¯»ÉѹËõ×î¶Ì¹ý³ÌÖУ¬¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉ£¬ÓУº
qEs1+
1 |
2 |
´úÈëÊý¾Ý½âµÃ£ºs1=0.02m¡¡
É赯»ÉµÚÒ»´Î»Ö¸´µ½Ô³¤Ê±£¬AB¹²Í¬¶¯ÄÜΪEk£¬¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉ£¬ÓУº
E0=qEs1+¦Ì£¨M+m£©g s1+Ek ¢Ù
ÔÚµ¯»É°ÑBAÍùÓÒÍƳöµÄ¹ý³ÌÖУ¬ÓÉÓÚBÊܵ½Ïò×óµÄĦ²ÁÁ¦Ð¡ÓÚAÊܵ½µÄÏò×óµÄĦ²ÁÁ¦ºÍµç³¡Á¦Ö®ºÍ£®¹ÊÖÁËûÃÇֹ֮ͣǰ£¬Á½ÕßûÓзֿª£®
µ¯»ÉµÚÒ»´Î½«ABµ¯³öÖÁÁ½Õßͬʱͬ´¦Í£Ö¹Ê±£¬B¾àÀëÊúֱǽ±Ú×îÔ¶£¬Éè´Ëʱ¾àÀ뵯»ÉÔ³¤´¦Îªs2£¬¸ù¾Ý¶¯Äܶ¨Àí£¬ÓУº
-qEs2-¦Ì£¨M+m£©g s2=0-Ek ¢Ú
¢Ù¢ÚÁªÁ¢²¢´úÈëÊý¾Ý½âµÃ£ºs2=0.03m
¹ÊBÀëǽ±ÚµÄ×î´ó¾àÀësm=s+s2=0.08m
´ð£º
¡¡£¨1£©Á½»¬¿éÔÚÅöײǰµÄ˲ʱ£¬»¬¿éAµÄËÙ¶ÈΪ3m/s£®
£¨2£©»¬¿éAÆðʼÔ˶¯Î»ÖÃÓ뻬¿éBµÄ¾àÀë?Ϊ0.3m£®
£¨3£©B»¬¿é±»µ¯»Éµ¯¿ªºó¾àÊúֱǽµÄ×î´ó¾àÀësmΪ0.08m£®
µãÆÀ£º±¾ÌâÖ÷Òª¿¼²éÁ˶¯Äܶ¨ÀíºÍ¶¯Á¿Êغ㶨ÂɵÄÖ±½ÓÓ¦Óã¬ÒªÅàÑø×Ô¼º·ÖÎöÎïÀí¹ý³Ì£¬°ÑÎÕÎïÀí¹æÂÉ£¬½â¾ö×ÛºÏÌâµÄÄÜÁ¦£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿