ÌâÄ¿ÄÚÈÝ
ÈçÏÂͼËùʾ£¬EFΪ¾øԵˮƽÃ棬Oµã×ó²àÊǴֲڵģ¬ÓÒ²àÊǹ⻬µÄ£¬Ò»ÇáÖʾøÔµµ¯»ÉÓҶ˹̶¨ÔÚǽ±ÚÉÏ£¬×ó¶ËÓë¾²Ö¹ÔÚOµã¡¢ÖÊÁ¿ÎªmµÄ²»´øµçСÎï¿éAÁ¬½Ó£¬µ¯»É´¦ÓÚÔ³¤×´Ì¬¡£ÖÊÁ¿Îª(1)³·È¥µç³¡ºóµ¯»ÉµÄ×î´óµ¯ÐÔÊÆÄÜ£»
(2)·µ»ØÔ˶¯µÄ¹ý³ÌÖУ¬Îï¿éBÓÉOµãÏò×óÔ˶¯Ö±µ½¾²Ö¹ËùÓõÄʱ¼ä¡£
½â£º£¨1£©Îï¿éB´ÓCÖÁOµÄ¹ý³ÌÖУ¬Ôڵ糡Á¦ºÍĦ²ÁÁ¦µÄ×÷ÓÃÏÂ×öÔȼÓËÙÖ±ÏßÔ˶¯£¬ÉèËüµ½´ïOµãʱµÄËÙÂÊΪv0
¶ÔBÓɶ¯Äܶ¨ÀíÓУ¨Eq-f)¡Á
½«f=0.2Eq´úÈëÉÏʽ
½âµÃv0=2
A¡¢BÅöײ¹ý³ÌÖУ¬ÏµÍ³¶¯Á¿½üËÆÊغ㣬ÉèÅöºóµÄ¹²Í¬ËÙÂÊΪv1
Óɶ¯Á¿Êغ㶨ÂÉÓÐ2mv0=(m+
½âµÃv1=
ÅöºóA¡¢BÒ»ÆðÏòÓÒÔ˶¯£¬µ±ËٶȼõΪÁãʱ£¬µ¯»É±»Ñ¹ËõÖÁ×î¶Ì£¬µ¯»É¾ßÓÐ×î´óµ¯ÐÔÊÆÄÜEpmax.
¶ÔÕâÒ»¹ý³Ì£¬Óɹ¦ÄܹØϵÓÐEqL+(
½âµÃEpmax=EqL.
£¨2£©ÉèËüÃÇ·µ»Øµ½Oµãʱ£¬ËÙÂÊΪv2
Òò´Óµ¯»É×î¶Ì´¦·µ»Øµ½OµãµÄ¹ý³ÌÖУ¬ÏµÍ³»úеÄÜÊغã
¹ÊEpmax=(
½âµÃv2=
ÔÚ·µ»ØÖÁOµãºó£¬A¡¢B½«·ÖÀ룬֮ºóBÎï¿é½«Ïò×ó×öÔȼõËÙÖ±ÏßÔ˶¯£¬Ö±µ½¾²Ö¹
¶ÔBÓɶ¯Á¿¶¨ÀíÓÐ-ft=0-2mv2
½âµÃt=.
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿