ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬¹â»¬Ë®Æ½ÃæABµÄ×ó¶ËA´¦¹Ì¶¨Ò»Çᵯ»É£¬ÓÒ¶ËB´¦Óëˮƽ´«ËÍ´øǡƽÆë½Ó´¥£¬´«ËÍ´øˮƽ²¿·Ö³¤¶ÈL=3.5m£®µ±´«ËÍ´øÉÏûÓÐÎï¿éʱ£¬´«ËÍ´ø²»¶¯£»µ±´«ËÍ´øÉÏÓÐÎï¿éʱ£¬´«ËÍ´øÁ¢¼´ÒÔa=1m/s2µÄ¼ÓËÙ¶È˳ʱÕë¼ÓËÙÔ˶¯£®´«ËÍ´øÓÒ¶ËC´¦Óë¹â»¬Ë®Æ½ÃæǡƽÆë½Ó´¥£¬ÔÚÓÒ¶ËˮƽÃæÉϹ̶¨ÓÐÄڱڹ⻬µÄ°ëÔ²¹ìµÀDEG£¬¹ìµÀµ×¶ËDÓëˮƽÃæÏàÇУ®¿ÉÊÓΪÖʵãµÄÁ½Îï¿é1¡¢2Ö®¼äÓÐÉÙÁ¿Õ¨Ò©£¬²¢½ô¿¿ÔÚÒ»Æ𣬾²Ö¹ÔÚˮƽÃæABÉÏij´¦£¬Õ¨Ò©±¬Õ¨£¬Îï¿é1Ïò×óÔ˶¯Ñ¹Ëõµ¯»É£¬µ±µ¯»ÉѹËõµ½×î¶Ìʱ£¬½«µ¯»ÉºÍÎï¿é1Ëø¶¨£¬²âµÃ´Ëʱµ¯ÐÔÊÆÄÜEp=l2J£¬Îï¿é2ÏòÓÒͨ¹ý´«ËÍ´øºó£¬´ÓDµã½øÈë¹ìµÀDEG£¬Îï¿é2Ç¡ºÃͨ¹ý×î¸ßµãG£®ÒÑÖªÎï¿é1¡¢2ÖÊÁ¿·Ö±ðΪm1=1.5kg£¬m2=2kg£¬Îï¿é2Óë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì=0.2£¬g=10m/s2£®Ç󣺣¨1£©±¬Õ¨ºó£¬Îï¿é2µÄËÙ¶ÈV2ÊǶà´ó£¿
£¨2£©Îï¿é2ÔÚ´«ËÍ´øÉÏÔ˶¯µÄʱ¼ätÊǶàÉÙ£¿
£¨3£©¹ìµÀ°ë¾¶RÊǶà´ó£¿

¡¾´ð°¸¡¿·ÖÎö£º£¨1£©±¬Õ¨ºóÎï¿é1¶¯ÄÜÈ«²¿×ª»¯Îªµ¯»Éµ¯ÐÔÊÆÄÜ£¬¸ù¾Ý¹¦ÄܹØϵ¿ÉÒÔÇó³ö±¬Õ¨ºóÎï¿é1µÄËٶȣ¬È»ºó¸ù¾Ý±¬Õ¨¹ý³ÌÖÐˮƽ·½Ïò¶¯Á¿Êغ㼴¿ÉÇó³ö½á¹û£®
£¨2£©Îï¿éÔÚ´«ËÍ´øÉÏÔ˶¯Ê±£¬×¢Òâµ±Îï¿éËٶȺʹ«ËÍ´øËÙ¶ÈÏàµÈʱ£¬Îï¿éºÍ´«ËÍ´øÏà¶Ô¾²Ö¹½«Ò»ÆðÔȼÓËÙÔ˶¯£¬Òò´ËÒªÅжÏÎï¿éÔÚ´«ËÍ´øÉϵÄÔ˶¯ÐÎʽ£®
£¨3£©Îï¿éÇ¡ºÃͨ¹ý×î¸ßµãµÄÌõ¼þÊÇÖØÁ¦Ç¡ºÃÌṩÏòÐÄÁ¦£¬¸ù¾ÝÏòÐÄÁ¦¹«Ê½ºÍ¶¯Äܶ¨Àí¼´¿É½â´ð±¾Ì⣮
½â´ð£º½â£º£¨1£©±¬Õ¨Ë²¼ä£¬ÉèÎï¿é1µÄËٶȴóСv1£¬Ôò
m1v1-m2v2=0 ¢Ù
¢Ú
ÁªÁ¢¢Ù¢Ú½âµÃ£ºv2=3 m/s
¹Ê±¬Õ¨ºó£¬Îï¿é2µÄËÙ¶Èv2=3 m/s£®
£¨2£©ÉèÎï¿éÓë´«ËÍ´ø¹²ËÙÇ°Îï¿é2µÄ¼ÓËÙ¶ÈΪa£¬Ôò¦Ìm2g=m2a
Éè¾¹ýʱ¼ät1ºó£¬Îï¿é2Óë´«ËÍ´øËÙ¶ÈÏàµÈ£¬Ôò at1=v2-at1
½âµÃt1=1s
ÉèÔÚt1Õâ¶Îʱ¼äÄÚÎï¿é2ͨ¹ýµÄ¾àÀëÊÇs1£¬Ôò£º

ËùÒÔ£¬Îï¿é2δµ½´ïÓҶˣ®
ÓÉÓÚa£¼¦Ìg£¬´ËºóÎï¿é2½«ºÍ´«ËÍ´øÒÔ¹²Í¬µÄ¼ÓËÙ¶ÈaÔ˶¯£¬Éè¾¹ýʱ¼ät2µ½´ïÓҶˣ¬Ôò

½âµÃ£ºt2=1 s
ÉèÎï¿é2ÔÚ´«ËÍ´øÉÏÔ˶¯µÄʱ¼ät£¬Ôòt=t1+t2=2 s
¹ÊÎï¿é2ÔÚ´«ËÍ´øÉÏÔ˶¯µÄʱ¼ät=2s£®
£¨3£©ÉèÎï¿é2µ½´ï´«ËÍ´øÓÒ¶ËʱËÙ¶ÈΪv3£¬Ôòv3=at1+at2=2 m/s
ÉèÎï¿é2µ½´ï×î¸ßµãGʱ£¬ËÙ¶ÈΪvG£¬
¢Û
¶ÔÎï¿é2£¬´ÓCµ½G£¬ÓÉ»úеÄÜÊغ㶨Âɵãº
¢Ü
ÁªÁ¢¢Û¢Ü½âµÃR=0.08m£®
¹Ê¹ìµÀ°ë¾¶RΪ0.08m£®
µãÆÀ£º±¾Ìâ¹ý³Ì¸´ÔÓ£¬¿¼²éÁËѧÉú×ÛºÏÓ¦ÓÃÎïÀí֪ʶ½â¾öÎÊÌâµÄÄÜÁ¦£¬ÓÈÆäÊÇÔÚ·ÖÎöÎïÌåÔÚ´«ËÍ´øÉÏÔ˶¯Ê±£¬ÒªÍ¨¹ýÕýÈ··ÖÎöÎïÌåÊÜÁ¦Çé¿ö£¬È·¶¨ÆäÔ˶¯ÐÎʽ£¬È»ºóÒÀ¾ÝÏàÓ¦¹æÂÉÇó½â£»´¦ÀíÊúÖ±·½ÏòÉϵÄÔ²ÖÜÔ˶¯Ê±×¢ÒâÏòÐÄÁ¦¹«Ê½ºÍ¶¯Äܶ¨ÀíµÄÁªºÏÓ¦Óã®
£¨2£©Îï¿éÔÚ´«ËÍ´øÉÏÔ˶¯Ê±£¬×¢Òâµ±Îï¿éËٶȺʹ«ËÍ´øËÙ¶ÈÏàµÈʱ£¬Îï¿éºÍ´«ËÍ´øÏà¶Ô¾²Ö¹½«Ò»ÆðÔȼÓËÙÔ˶¯£¬Òò´ËÒªÅжÏÎï¿éÔÚ´«ËÍ´øÉϵÄÔ˶¯ÐÎʽ£®
£¨3£©Îï¿éÇ¡ºÃͨ¹ý×î¸ßµãµÄÌõ¼þÊÇÖØÁ¦Ç¡ºÃÌṩÏòÐÄÁ¦£¬¸ù¾ÝÏòÐÄÁ¦¹«Ê½ºÍ¶¯Äܶ¨Àí¼´¿É½â´ð±¾Ì⣮
½â´ð£º½â£º£¨1£©±¬Õ¨Ë²¼ä£¬ÉèÎï¿é1µÄËٶȴóСv1£¬Ôò
m1v1-m2v2=0 ¢Ù

ÁªÁ¢¢Ù¢Ú½âµÃ£ºv2=3 m/s
¹Ê±¬Õ¨ºó£¬Îï¿é2µÄËÙ¶Èv2=3 m/s£®
£¨2£©ÉèÎï¿éÓë´«ËÍ´ø¹²ËÙÇ°Îï¿é2µÄ¼ÓËÙ¶ÈΪa£¬Ôò¦Ìm2g=m2a
Éè¾¹ýʱ¼ät1ºó£¬Îï¿é2Óë´«ËÍ´øËÙ¶ÈÏàµÈ£¬Ôò at1=v2-at1
½âµÃt1=1s
ÉèÔÚt1Õâ¶Îʱ¼äÄÚÎï¿é2ͨ¹ýµÄ¾àÀëÊÇs1£¬Ôò£º

ËùÒÔ£¬Îï¿é2δµ½´ïÓҶˣ®
ÓÉÓÚa£¼¦Ìg£¬´ËºóÎï¿é2½«ºÍ´«ËÍ´øÒÔ¹²Í¬µÄ¼ÓËÙ¶ÈaÔ˶¯£¬Éè¾¹ýʱ¼ät2µ½´ïÓҶˣ¬Ôò

½âµÃ£ºt2=1 s
ÉèÎï¿é2ÔÚ´«ËÍ´øÉÏÔ˶¯µÄʱ¼ät£¬Ôòt=t1+t2=2 s
¹ÊÎï¿é2ÔÚ´«ËÍ´øÉÏÔ˶¯µÄʱ¼ät=2s£®
£¨3£©ÉèÎï¿é2µ½´ï´«ËÍ´øÓÒ¶ËʱËÙ¶ÈΪv3£¬Ôòv3=at1+at2=2 m/s
ÉèÎï¿é2µ½´ï×î¸ßµãGʱ£¬ËÙ¶ÈΪvG£¬

¶ÔÎï¿é2£¬´ÓCµ½G£¬ÓÉ»úеÄÜÊغ㶨Âɵãº

ÁªÁ¢¢Û¢Ü½âµÃR=0.08m£®
¹Ê¹ìµÀ°ë¾¶RΪ0.08m£®
µãÆÀ£º±¾Ìâ¹ý³Ì¸´ÔÓ£¬¿¼²éÁËѧÉú×ÛºÏÓ¦ÓÃÎïÀí֪ʶ½â¾öÎÊÌâµÄÄÜÁ¦£¬ÓÈÆäÊÇÔÚ·ÖÎöÎïÌåÔÚ´«ËÍ´øÉÏÔ˶¯Ê±£¬ÒªÍ¨¹ýÕýÈ··ÖÎöÎïÌåÊÜÁ¦Çé¿ö£¬È·¶¨ÆäÔ˶¯ÐÎʽ£¬È»ºóÒÀ¾ÝÏàÓ¦¹æÂÉÇó½â£»´¦ÀíÊúÖ±·½ÏòÉϵÄÔ²ÖÜÔ˶¯Ê±×¢ÒâÏòÐÄÁ¦¹«Ê½ºÍ¶¯Äܶ¨ÀíµÄÁªºÏÓ¦Óã®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿