ÌâÄ¿ÄÚÈÝ
£¨2001?ÉϺ££©ÈçͼAËùʾ£¬Ò»ÖÊÁ¿ÎªmµÄÎïÌåϵÓÚ³¤¶È·Ö±ðΪl1¡¢l2µÄÁ½¸ùϸÏßÉÏ£¬l1µÄÒ»¶ËÐü¹ÒÔÚÌ컨°åÉÏ£¬ÓëÊúÖ±·½Ïò¼Ð½ÇΪ¦È£¬l2ˮƽÀÖ±£¬ÎïÌå´¦ÓÚƽºâ״̬£®ÏÖ½«l2Ïß¼ô¶Ï£¬Çó¼ô¶Ï˲ʱÎïÌåµÄ¼ÓËٶȣ®
£¨l£©ÏÂÃæÊÇijͬѧ¶Ô¸ÃÌâµÄÒ»Öֽⷨ£º
½â£ºÉèl1ÏßÉÏÀÁ¦ÎªT1£¬ÏßÉÏÀÁ¦ÎªT2£¬ÖØÁ¦Îªmg£¬ÎïÌåÔÚÈýÁ¦×÷ÓÃϱ£³ÖƽºâT1cos¦È=mg£¬T1sin¦È=T2£¬T2=mgtan¦È¼ô¶ÏÏßµÄ˲¼ä£¬T2ͻȻÏûʧ£¬ÎïÌå¼´ÔÚT2·´·½Ïò»ñµÃ¼ÓËٶȣ®ÒòΪmgtan¦È=ma£¬ËùÒÔ¼ÓËÙ¶Èa=gtan¦È£¬·½ÏòÔÚT2·´·½Ïò£®ÄãÈÏΪÕâ¸ö½á¹ûÕýÈ·Âð£¿Çë¶Ô¸Ã½â·¨×÷³öÆÀ¼Û²¢ËµÃ÷ÀíÓÉ£®
£¨2£©Èô½«Í¼AÖеÄϸÏßl1¸ÄΪ³¤¶ÈÏàͬ¡¢ÖÊÁ¿²»¼ÆµÄÇᵯ»É£¬ÈçͼBËùʾ£¬ÆäËûÌõ¼þ²»±ä£¬Çó½âµÄ²½ÖèºÍ½á¹ûÓ루l£©ÍêÈ«Ïàͬ£¬¼´ a=g tan¦È£¬ÄãÈÏΪÕâ¸ö½á¹ûÕýÈ·Âð£¿Çë˵Ã÷ÀíÓÉ£®
£¨l£©ÏÂÃæÊÇijͬѧ¶Ô¸ÃÌâµÄÒ»Öֽⷨ£º
½â£ºÉèl1ÏßÉÏÀÁ¦ÎªT1£¬ÏßÉÏÀÁ¦ÎªT2£¬ÖØÁ¦Îªmg£¬ÎïÌåÔÚÈýÁ¦×÷ÓÃϱ£³ÖƽºâT1cos¦È=mg£¬T1sin¦È=T2£¬T2=mgtan¦È¼ô¶ÏÏßµÄ˲¼ä£¬T2ͻȻÏûʧ£¬ÎïÌå¼´ÔÚT2·´·½Ïò»ñµÃ¼ÓËٶȣ®ÒòΪmgtan¦È=ma£¬ËùÒÔ¼ÓËÙ¶Èa=gtan¦È£¬·½ÏòÔÚT2·´·½Ïò£®ÄãÈÏΪÕâ¸ö½á¹ûÕýÈ·Âð£¿Çë¶Ô¸Ã½â·¨×÷³öÆÀ¼Û²¢ËµÃ÷ÀíÓÉ£®
£¨2£©Èô½«Í¼AÖеÄϸÏßl1¸ÄΪ³¤¶ÈÏàͬ¡¢ÖÊÁ¿²»¼ÆµÄÇᵯ»É£¬ÈçͼBËùʾ£¬ÆäËûÌõ¼þ²»±ä£¬Çó½âµÄ²½ÖèºÍ½á¹ûÓ루l£©ÍêÈ«Ïàͬ£¬¼´ a=g tan¦È£¬ÄãÈÏΪÕâ¸ö½á¹ûÕýÈ·Âð£¿Çë˵Ã÷ÀíÓÉ£®
·ÖÎö£º£¨1£©Ï¸ÏßÔÚ¼ô¶ÏµÄ˲¼ä£¬Éþ×ÓÉϵÄÁ¦·¢ÉúÍ»±ä£¬¹Ê²»ÄÜÔÙÖ±½Ó¸ù¾ÝºÏ³É·¨Çó³öºÏÁ¦£»
£¨2£©Èô¸Ä³ÉÇᵯ»Éºó£¬ÓÉÓÚµ¯»ÉµÄµ¯Á¦²»ÄÜÍ»±ä£¬¿ÉÒÔÖ±½ÓÇó³öºÏÁ¦£®
£¨2£©Èô¸Ä³ÉÇᵯ»Éºó£¬ÓÉÓÚµ¯»ÉµÄµ¯Á¦²»ÄÜÍ»±ä£¬¿ÉÒÔÖ±½ÓÇó³öºÏÁ¦£®
½â´ð£º½â£º£¨1£©½â´ð´íÎó£®
ÒòΪI2±»¼ô¶ÏµÄ˲¼ä£¬l1ÉϵÄÕÅÁ¦´óС·¢ÉúÁ˱仯£¬´ËʱӦ½«ÖØÁ¦·Ö½âΪÑØÉþºÍ´¹Ö±ÓÚÉþÁ½¸ö·½Ïò½øÐзֽ⣻´Ó¶øÇó³öºÏÁ¦£¬ÔÙÇó³ö¼ÓËٶȣ»
£¨2£©ÕýÈ·£®
ÒòΪG±»¼ô¶ÏµÄ˲¼ä£¬µ¯»ÉUµÄ³¤¶ÈÄ©¼°·¢Éú±ä»¯£¬ÄË´óСºÍ·½Ïò¶¼²»±ä£¬¹Ê´Ëʱµ¯»ÉµÄµ¯Á¦²»±ä£¬¹ÊÒÔÉÏÇó·¨ÕýÈ·£®
ÒòΪI2±»¼ô¶ÏµÄ˲¼ä£¬l1ÉϵÄÕÅÁ¦´óС·¢ÉúÁ˱仯£¬´ËʱӦ½«ÖØÁ¦·Ö½âΪÑØÉþºÍ´¹Ö±ÓÚÉþÁ½¸ö·½Ïò½øÐзֽ⣻´Ó¶øÇó³öºÏÁ¦£¬ÔÙÇó³ö¼ÓËٶȣ»
£¨2£©ÕýÈ·£®
ÒòΪG±»¼ô¶ÏµÄ˲¼ä£¬µ¯»ÉUµÄ³¤¶ÈÄ©¼°·¢Éú±ä»¯£¬ÄË´óСºÍ·½Ïò¶¼²»±ä£¬¹Ê´Ëʱµ¯»ÉµÄµ¯Á¦²»±ä£¬¹ÊÒÔÉÏÇó·¨ÕýÈ·£®
µãÆÀ£º±¾ÌâҪעÒⵯ»ÉµÄµ¯Á¦²»ÄÜÍ»±ä£¬¶øÉþ×ӵĵ¯Á¦¿ÉÒÔÍ»±ä£»Ó¦Çø±ð¶Ô´ý£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿