ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬¾øÔµµ²°åP¹Ì¶¨ÔÚÇã½ÇΪ¦ÈµÄ¾øԵбÃæÉÏ£¬ÖÊÁ¿·Ö±ðΪm1¡¢m2µÄСÎï¿éAºÍB¾ù¿ÉÊÓΪÖʵ㣬ÇÒ¾ù´øÓÐ+qµÄµçÁ¿£¬Á½Îï¿éÓɾøÔµµÄÇᵯ»ÉÏàÁ¬£¬Ò»²»¿ÉÉ쳤µÄ¾øÔµÇáÉþ¿ç¹ý»¬ÂÖ£¬Ò»¶ËÓëBÁ¬½Ó£¬ÁíÒ»¶ËÁ¬½ÓÒ»ÇáÖÊС¹³£®Õû¸ö×°Öô¦Ôڵ糡ǿ¶È´óСΪE¡¢·½ÏòƽÐÐÓÚбÃæÏòϵÄÔÈÇ¿µç³¡ÖУ¬A¡¢B×î³õ¾²Ö¹£®ÒÑÖªµ¯»ÉµÄ¾¢¶ÈϵÊýΪk£¬²»¼ÆÒ»ÇÐĦ²Á¼°A¡¢B¼äµÄ¿âÂØÁ¦£¬ÇÒB²»»áÅöµ½»¬ÂÖ£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£®
£¨1£©ÈôÔÚС¹³ÉϹÒÒ»ÖÊÁ¿ÎªMµ«²»´øµçµÄÎï¿éC£¬²¢Óɾ²Ö¹ÊÍ·Å£¬Ç¡ºÃÄÜʹÎï¿éAÀ뿪µ²°åP£¬ÔòCÏÂÂäµÄ¾àÀëÊǶàÉÙ£¿
£¨2£©ÈôÎï¿éCµÄÖÊÁ¿¸ÄΪ2M£¬²¢Óɾ²Ö¹ÊÍ·Å£¬Ôòµ±A¸ÕÀ뿪µ²°åPʱBµÄËÙ¶ÈÊǶà´ó£¿
£¨1£©ÈôÔÚС¹³ÉϹÒÒ»ÖÊÁ¿ÎªMµ«²»´øµçµÄÎï¿éC£¬²¢Óɾ²Ö¹ÊÍ·Å£¬Ç¡ºÃÄÜʹÎï¿éAÀ뿪µ²°åP£¬ÔòCÏÂÂäµÄ¾àÀëÊǶàÉÙ£¿
£¨2£©ÈôÎï¿éCµÄÖÊÁ¿¸ÄΪ2M£¬²¢Óɾ²Ö¹ÊÍ·Å£¬Ôòµ±A¸ÕÀ뿪µ²°åPʱBµÄËÙ¶ÈÊǶà´ó£¿
·ÖÎö£º£¨1£©³õʼ״̬µ¯»É´¦ÓÚѹËõ״̬£¬ÐαäÁ¿Îª x1£¬Îï¿éAÇ¡ºÃÄÜÀ뿪µ²°åPʱ£¬¶Ôµ²°åPµÄѹÁ¦Ç¡ÎªÁ㣬¸ù¾Ýºú¿Ë¶¨ÂÉ´Ëʱµ¯»ÉµÄÉ쳤Á¿x2£¬Á½ÕßÖ®ºÍÒ²¾ÍÊÇCÎïÌåµÄϽµ¾àÀ룮
£¨2£©ÈôCµÄÖÊÁ¿¸ÄΪ2m£¬Ôòµ±A¸ÕÀ뿪µ²°åPʱ£¬µ¯»ÉµÄÉ쳤Á¿ÈÔΪx2£¬µ«´ËʱAÎïÌå¾²Ö¹µ«B¡¢CÁ½ÎïÌåµÄËÙ¶ÈÏàµÈÇÒ²»ÎªÁ㣬´Ë¹ý³ÌÖÐCÎïÌåÖØÁ¦ÊÆÄܼõÉÙÁ¿µÈÓÚBÎïÌå»úеÄܺ͵çÊÆÄܵÄÔöÁ¿¡¢µ¯»Éµ¯»Éµ¯ÐÔÊÆÄÜÔöÁ¿¼°ÏµÍ³¶¯ÄܵÄÔöÁ¿Ö®ºÍ£®
£¨2£©ÈôCµÄÖÊÁ¿¸ÄΪ2m£¬Ôòµ±A¸ÕÀ뿪µ²°åPʱ£¬µ¯»ÉµÄÉ쳤Á¿ÈÔΪx2£¬µ«´ËʱAÎïÌå¾²Ö¹µ«B¡¢CÁ½ÎïÌåµÄËÙ¶ÈÏàµÈÇÒ²»ÎªÁ㣬´Ë¹ý³ÌÖÐCÎïÌåÖØÁ¦ÊÆÄܼõÉÙÁ¿µÈÓÚBÎïÌå»úеÄܺ͵çÊÆÄܵÄÔöÁ¿¡¢µ¯»Éµ¯»Éµ¯ÐÔÊÆÄÜÔöÁ¿¼°ÏµÍ³¶¯ÄܵÄÔöÁ¿Ö®ºÍ£®
½â´ð£º½â£º£¨1£©¿ªÊ¼Ê±µ¯»É±»Ñ¹ËõµÄÐαäÁ¿Îªx1£¬ÓÉƽºâÌõ¼þ£ºkx1=EqB+m2gsin¦È
Éèµ±A¸ÕÀ뿪µµ°åʱµ¯»É±»ÀÉìµÄÐαäÁ¿Îªx2£¬ÓÉƽºâÌõ¼þ£ºkx2=qAE+m1gsin¦È
¹ÊCϽµµÄ×î´ó¾àÀëΪ£ºh=x1+x2
ÓÉ¢Ù¡«¢Ûʽ¿É½âµÃh=
(qA+qB)+
£¨2£©ÓÉÄÜÁ¿Êغ㶨ÂÉ¿ÉÖª£º
µ±CµÄÖÊÁ¿ÎªMʱ£ºMgh=qBEh+m2g?hsin¦È+¡÷Eµ¯
µ±CµÄÖÊÁ¿Îª2Mʱ£¬ÉèA¸ÕÀ뿪µ²°åʱBµÄËÙ¶ÈΪv£º2Mgh=qBEh+m2g?hsin¦È+¡÷Wµ¯+
(2M+mB)v2
½âµÃA¸ÕÀ뿪PʱBµÄËÙ¶ÈΪ£ºv=
=
?
´ð£º
£¨1£©Îï¿éCÏÂÂäµÄ×î´ó¾àÀëΪh=
(qA+qB)+
£»
£¨2£©µ±A¸ÕÀ뿪µ²°åPʱ£¬BµÄËÙ¶ÈΪv=
?
£®
Éèµ±A¸ÕÀ뿪µµ°åʱµ¯»É±»ÀÉìµÄÐαäÁ¿Îªx2£¬ÓÉƽºâÌõ¼þ£ºkx2=qAE+m1gsin¦È
¹ÊCϽµµÄ×î´ó¾àÀëΪ£ºh=x1+x2
ÓÉ¢Ù¡«¢Ûʽ¿É½âµÃh=
E |
k |
(m1+m2)gsin¦È |
k |
£¨2£©ÓÉÄÜÁ¿Êغ㶨ÂÉ¿ÉÖª£º
µ±CµÄÖÊÁ¿ÎªMʱ£ºMgh=qBEh+m2g?hsin¦È+¡÷Eµ¯
µ±CµÄÖÊÁ¿Îª2Mʱ£¬ÉèA¸ÕÀ뿪µ²°åʱBµÄËÙ¶ÈΪv£º2Mgh=qBEh+m2g?hsin¦È+¡÷Wµ¯+
1 |
2 |
½âµÃA¸ÕÀ뿪PʱBµÄËÙ¶ÈΪ£ºv=
|
|
|
´ð£º
£¨1£©Îï¿éCÏÂÂäµÄ×î´ó¾àÀëΪh=
E |
k |
(m1+m2)gsin¦È |
k |
£¨2£©µ±A¸ÕÀ뿪µ²°åPʱ£¬BµÄËÙ¶ÈΪv=
|
|
µãÆÀ£º±¾Ìâ¹ý³Ì½Ï·±ÔÓ£¬Éæ¼°¹¦ÄܹØϵ¶à£¬Óе¯ÐÔÊÆÄÜ¡¢µçÊÆÄÜ¡¢ÖØÁ¦ÊÆÄܵÈÖ®¼äµÄת»¯£¬È«Ã濼²ìÁËѧÉú×ۺϷÖÎöÎÊÌâÄÜÁ¦ºÍ¶Ô¹¦ÄܹØϵµÄÀí½â¼°Ó¦Óã¬ÄѶȽϴ󣮶ÔÓÚÕâÀàÌâÄ¿ÔÚ·ÖÎö¹ý³ÌÖУ¬Òª»¯·±Îª¼ò£¬¼´°Ñ¸´ÔÓ¹ý³Ì£¬·Ö½âΪ¶à¸öС¹ý³Ì·ÖÎö£¬Í¬Ê±ÒªÕýÈ··ÖÎöÊÜÁ¦Çé¿ö£¬ÅªÇåϵͳÔ˶¯×´Ì¬ÒÔ¼°¹¦ÄܹØϵ£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿