ÌâÄ¿ÄÚÈÝ

Èçͼ16-4-14Ëùʾ£¬°ë¾¶ÎªRµÄ¹â»¬Ô²ÐιìµÀ¹Ì¶¨ÔÚÊúÖ±ÃæÄÚ.СÇòA¡¢BÖÊÁ¿·Ö±ðΪm¡¢¦Âm(¦ÂΪ´ý¶¨ÏµÊý).AÇò´Ó×ó±ßÓëÔ²Ðĵȸߴ¦Óɾ²Ö¹¿ªÊ¼ÑعìµÀÏ»¬£¬Óë¾²Ö¹ÓÚ¹ìµÀ×îµÍµãµÄBÇòÏàײ£¬ÅöײºóA¡¢BÇòÄÜ´ïµ½µÄ×î´ó¸ß¶È¾ùΪR£¬ÅöײÖÐÎÞ»úеÄÜËðʧ.ÖØÁ¦¼ÓËÙ¶ÈΪg.ÊÔÇó£º

ͼ16-4-14

(1)´ý¶¨ÏµÊý¦Â£»

(2)µÚÒ»´ÎÅöײ¸Õ½áÊøʱСÇòA¡¢B¸÷×ÔµÄËٶȺÍBÇò¶Ô¹ìµÀµÄѹÁ¦£»

(3)СÇòA¡¢BÔÚ¹ìµÀ×îµÍ´¦µÚ¶þ´ÎÅöײ¸Õ½áÊøʱ¸÷×ÔµÄËٶȣ¬²¢ÌÖÂÛСÇòA¡¢BÔÚ¹ìµÀ×îµÍ´¦µÚn´ÎÅöײ¸Õ½áÊøʱ¸÷×ÔµÄËÙ¶È.

(1)¦Â=3

(2)

N¡ä=-N=-4.5 mg£¬·½ÏòÊúÖ±ÏòÏÂ

(3)

µ±nΪÆæÊýʱ£¬Ð¡ÇòA¡¢BÔÚµÚn´ÎÅöײ¸Õ½áÊøʱµÄËٶȷֱðÓëÆäµÚÒ»´ÎÅöײ¸Õ½áÊøʱÏàͬ£»

µ±nΪżÊýʱ£¬Ð¡ÇòA¡¢BÔÚµÚn´ÎÅöײ¸Õ½áÊøʱµÄËٶȷֱðÓëÆäµÚ¶þ´ÎÅöײ¸Õ½áÊøʱÏàͬ.


½âÎö:

ÅöײÖÐÎÞ»úеÄÜ£¬¿É¸ù¾Ý»úеÄÜÊغ㶨ÂɼÆËã³öϵÊý¦Â£»¸ù¾Ý»úеÄÜÊغã¿É¼ÆËã³öÅöײºóÁ½ÇòµÄËٶȣ¬Ó¦ÓÃÅ£¶ÙµÚ¶þ¶¨ÂɿɼÆËãBÇò¶Ô¹ìµÀµÄѹÁ¦£»¸ù¾ÝÅöײÖж¯Á¿ÊغãСÇòA¡¢BÔÚ¹ìµÀ×îµÍ´¦µÚ¶þ´ÎÅöײ¸Õ½áÊøʱ¸÷×ÔµÄËٶȣ¬È»ºó¸ù¾Ýʵ¼ÊÇé¾°½øÐзÖÎöÌÖÂÛ.

(1)ÓÉmgR=+£¬µÃ¦Â=3

(2)ÉèA¡¢BÅöײºóµÄËٶȷֱðΪv1£¬v2£¬Ôò

mv12=

¦Âmv22=

ÉèÏòÓÒΪÕý¡¢Ïò×óΪ¸º£¬½âµÃ

v1=-£¬·½ÏòÏò×ó

v2=£¬·½ÏòÏòÓÒ

Éè¹ìµÀ¶ÔBÇòµÄÖ§³ÖÁ¦ÎªN¡ä£¬·½ÏòÊúÖ±ÏòÉÏΪÕý£¬ÊúÖ±ÏòÏÂΪ¸º

¼´N-¦Âmg=¦Âm

N¡ä=-N=-4.5 mg£¬·½ÏòÊúÖ±ÏòÏÂ

(3)ÉèA¡¢BÇòµÚ¶þ´ÎÅöײ¸Õ½áÊøʱµÄËٶȷֱðΪv1¡¢v2£¬Ôò

-mv1-¦Âmg=mv1+¦Âmv2

mgR=mv12+¦Âmv22

½âµÃ£ºv1=-,v2=0

(ÁíÒ»×é½âÎöv1=-v1,v2=-v2²»ºÏÌâÒ⣬ÉáÈ¥)

Óɴ˿ɵãº

µ±nΪÆæÊýʱ£¬Ð¡ÇòA¡¢BÔÚµÚn´ÎÅöײ¸Õ½áÊøʱµÄËٶȷֱðÓëÆäµÚÒ»´ÎÅöײ¸Õ½áÊøʱÏàͬ£»

µ±nΪżÊýʱ£¬Ð¡ÇòA¡¢BÔÚµÚn´ÎÅöײ¸Õ½áÊøʱµÄËٶȷֱðÓëÆäµÚ¶þ´ÎÅöײ¸Õ½áÊøʱÏàͬ.

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø