ÌâÄ¿ÄÚÈÝ
ÈçͼËùÊ¾ÎªÒ»Õæ¿Õʾ²¨¹Ü£¬µç×Ó´ÓµÆË¿K·¢³ö£¨³õËٶȲ»¼Æ£©£¬¾µÆË¿ÓëA°å¼äµÄ¼ÓËÙµçѹU1¼ÓËÙ£¬´ÓA°åÖÐÐÄ¿×ÑØÖÐÐÄÏßKOÉä³ö£¬È»ºó½øÈëÁ½¿éƽÐнðÊô°åM¡¢NÐÎ³ÉµÄÆ«×ªµç³¡ÖУ¨Æ«×ªµç³¡¿ÉÊÓΪÔÈÇ¿µç³¡£©£¬µç×Ó½øÈëM¡¢N¼äµç³¡Ê±µÄËÙ¶ÈÓëµç³¡·½Ïò´¹Ö±£¬µç×Ó¾¹ýµç³¡ºó´òÔÚÓ«¹âÆÁÉϵÄPµã¡£ÒÑÖª¼ÓËÙµçѹΪU1£¬M¡¢NÁ½°å¼äµÄµçѹΪU2£¬Á½°å¼äµÄ¾àÀëΪd£¬°å³¤ÎªL1£¬°åÓҶ˵½Ó«¹âÆÁµÄ¾àÀëΪL2£¬µç×ÓµÄÖÊÁ¿Îªm£¬µçºÉÁ¿Îªe¡£Çó£º
![]()
£¨1£©µç×Ó´©¹ýA°åʱµÄËÙ¶È´óС£»
£¨2£©µç×Ó´ÓÆ«×ªµç³¡Éä³öʱµÄ²àÒÆÁ¿£»
£¨3£©Pµãµ½OµãµÄ¾àÀë¡£
£¨1£©
£¨2£©
£¨3£©![]()
¡¾½âÎö¡¿£¨16·Ö£©½âÎö£º£¨1£©Éèµç×Ó¾µçѹU1¼ÓËÙºóµÄËÙ¶ÈΪv0£¬¸ù¾Ý¶¯Äܶ¨ÀíµÃ£º
e U1=
¡¡¡£¨2·Ö£©
½âµÃ£º
¡¡¡¡¡¡¡¡¡¡¡¡£¨2·Ö£©
£¨2£©µç×ÓÒÔËÙ¶Èv0½øÈëÆ«×ªµç³¡ºó£¬´¹Ö±Óڵ糡·½Ïò×÷ÔÈËÙÖ±ÏßÔ˶¯£¬Ñص糡·½Ïò×÷³õËÙ¶ÈΪÁãµÄÔȼÓËÙÖ±ÏßÔ˶¯¡£ÉèÆ«×ªµç³¡µÄµç³¡Ç¿¶ÈΪE£¬µç×ÓÔÚÆ«×ªµç³¡Ô˶¯µÄʱ¼äΪt1£¬µç×ӵļÓËÙ¶ÈΪa£¬À뿪ƫתµç³¡Ê±Ïà¶ÔÓÚÔÔ˶¯·½ÏòµÄ²àÒÆÁ¿Îªy1£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½µÃ£º
F=eE£¬
E=
£¬ F=ma£¬ a =![]()
t1=
£¬ y1=
¡¡¡¡¡¡¡¡¡¡¡£¨4·Ö£©
½âµÃ£º y1=
¡¡¡¡¡¡¡¡¡¡¡£¨2·Ö£©
£¨3£©Éèµç×ÓÀ뿪ƫתµç³¡Ê±Ñص糡·½ÏòµÄËÙ¶ÈΪvy£¬¸ù¾ÝÔ˶¯Ñ§¹«Ê½µÃ£º
vy=at1=
¡¡¡¡¡¡£¨2·Ö£©
µç×ÓÀ뿪ƫתµç³¡ºó×÷ÔÈËÙÖ±ÏßÔ˶¯£¬Éèµç×ÓÀ뿪ƫתµç³¡ºó´òÔÚÓ«¹âÆÁÉÏËùÓõÄʱ¼äΪt2£¬µç×Ó´òµ½Ó«¹âÆÁÉϵIJàÒÆÁ¿Îªy2£¬ÈçͼËùʾ
![]()
t2=
£¬ y2= vyt2
½âµÃ£ºy2=
¡¡¡¡¡¡¡¡¡¡¡£¨2·Ö£©
Pµ½OµãµÄ¾àÀëΪ y=y1+y2=
¡¡¡¡¡¡¡¡£¨2·Ö£©
±¾Ì⿼²éµÄÊÇ´øµçÁ£×ÓÔڵ糡ÖÐµÄÆ«×ªÎÊÌâ¡£ÊìÁ·ÕÆÎÕÆäÆ«×ª¹æÂɼ´¿É½â³ö´ËÌâ¡£