ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬ÖÊÁ¿m1=0.3kg µÄС³µ¾²Ö¹Ôڹ⻬µÄˮƽÃæÉÏ£¬³µ³¤L=15m£¬ÏÖÓÐÖÊÁ¿m2=0.2kg¿ÉÊÓΪÖʵãµÄÎï¿é£¬ÒÔˮƽÏòÓÒµÄËÙ¶Èv0=2m/s´Ó×ó¶Ë»¬ÉÏС³µ£¬×îºóÔÚ³µÃæÉÏij´¦ÓëС³µ±£³ÖÏà¶Ô¾²Ö¹£®Îï¿éÓë³µÃæ¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì=0.5£¬È¡g=10m/s2£¬Çó£º
£¨1£©Îï¿éÓëС³µ±£³ÖÏà¶Ô¾²Ö¹Ê±µÄËٶȴóСv£»
£¨2£©Îï¿éÔÚ³µÃæÉÏ»¬ÐеÄʱ¼ät£»
£¨3£©ÒªÊ¹Îï¿é²»´ÓС³µÓҶ˻¬³ö£¬Îï¿é»¬ÉÏС³µ×ó¶ËµÄËÙ¶È
²»³¬¹ý¶àÉÙ£®
£¨1£©Îï¿éÓëС³µ±£³ÖÏà¶Ô¾²Ö¹Ê±µÄËٶȴóСv£»
£¨2£©Îï¿éÔÚ³µÃæÉÏ»¬ÐеÄʱ¼ät£»
£¨3£©ÒªÊ¹Îï¿é²»´ÓС³µÓҶ˻¬³ö£¬Îï¿é»¬ÉÏС³µ×ó¶ËµÄËÙ¶È
v | ¡ä0 |
£¨1£©ÒÀ¾Ý¶¯Á¿ÊغãµÃ m2v0=£¨m1+m2£©v
½âµÃ v=0.8m/s
£¨2£©Îï¿éËùÊܵĻ¬¶¯Ä¦²ÁÁ¦´óСf=¦Ìm2g=1N
¶ÔС³µ£¬ÒÀ¾Ý¶¯Á¿¶¨ÀíµÃ ft=m1v
½âµÃt=0.24s
£¨3£©ÒÀ¾Ý¶¯Á¿ÊغãÓУºm2
v | ¡ä0 |
ÒÀ¾ÝÄÜÁ¿¹ØϵÓУº
1 |
2 |
v | ¡ä20 |
1 |
2 |
v | 2¹² |
½âµÃ v¡ä0=5
10 |
ÔòҪʹÎï¿é²»´ÓС³µÓҶ˻¬³ö£¬±ØÐëÂú×ã
v | ¡ä0 |
´ð£º
£¨1£©Îï¿éÓëС³µ±£³ÖÏà¶Ô¾²Ö¹Ê±µÄËٶȴóСvΪ0.8m/s£»
£¨2£©Îï¿éÔÚ³µÃæÉÏ»¬ÐеÄʱ¼ätÊÇ0.24s£»
£¨3£©ÒªÊ¹Îï¿é²»´ÓС³µÓҶ˻¬³ö£¬Îï¿é»¬ÉÏС³µ×ó¶ËµÄËÙ¶È
v | ¡ä0 |
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿