ÌâÄ¿ÄÚÈÝ
![](http://thumb.1010pic.com/pic3/upload/images/201201/60/76260a3c.png)
£¨1£©Ð¡Îï¿éÅöײǰËÙ¶ÈV0µÄ´óС£»
£¨2£©Åöײ¹ý³ÌÖÐϵͳËðʧµÄ»úеÄÜ£»
£¨3£©ºãÁ¦F×÷ÓÃʱ¼ä£®
·ÖÎö£º£¨1£©Ð¡ÇòÇ¡ºÃͨ¹ý×î¸ßµã×÷Ô²ÖÜÔ˶¯£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³öÁÙ½çËٶȣ¬¸ù¾Ý»úеÄÜÊغãÇó³öÅöײºóËٶȣ®Åöײ¹ý³ÌÖУ¬Îï¿éºÍСÇòϵͳ¶¯Á¿Êغ㣬Çó³öСÎï¿éÅöײǰËÙ¶ÈV0µÄ´óС£®
£¨2£©Åöײ¹ý³ÌÖÐϵͳËðʧµÄ»úеÄܾÍÊÇϵͳ¶¯Äܵı仯Á¿£®
£¨3£©¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½Çó³öºãÁ¦F×÷ÓÃʱ¼ä£®
£¨2£©Åöײ¹ý³ÌÖÐϵͳËðʧµÄ»úеÄܾÍÊÇϵͳ¶¯Äܵı仯Á¿£®
£¨3£©¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½Çó³öºãÁ¦F×÷ÓÃʱ¼ä£®
½â´ð£º½â£º£¨1£©Ð¡ÇòÇ¡ºÃͨ¹ý×î¸ßµã×÷Ô²ÖÜÔ˶¯£¬´ËʱÖØÁ¦¸ÕºÃÌṩÏòÐÄÁ¦£¬ÉèËÙ¶ÈΪV£¬ÓÐ
mg=m
µÃV=
ÉèСÇòÅöײºóËÙ¶ÈΪV1£¬ÆäºóÔÚ°ÚÖÁ×î¸ßµã¹ý³ÌÖУ¬»úеÄÜÊغ㣺
mV12=
mV2+mg?2L
´úÈëVÖµ¿ÉµÃV1=
Åöײ¹ý³ÌÖУ¬Îï¿éºÍСÇòϵͳ¶¯Á¿Êغ㣬ÓÐ
2mV0=mV1+2m?
´úÈëV1Öµ¿ÉµÃV0=
£¨2£©Åöײ¹ý³ÌÖÐϵͳËðʧµÄ»úеÄÜ
¡÷E=
?2m?V02-
?2m?(
)2-
mV12
´úÈëËùÇó³öµÄËÙ¶ÈÖµ¿ÉµÃ
¡÷E=
mgL
£¨3£©Ð¡ÇòÔÚˮƽÃæÔ˶¯µÄ¼ÓËÙ¶Èa=
ÓÉËٶȹ«Ê½V0=atµÃÁ¦F×÷ÓÃʱ¼ä
t=
=
´ð£º£¨1£©Ð¡Îï¿éÅöײǰËÙ¶ÈV0µÄ´óСÊÇ
£»
£¨2£©Åöײ¹ý³ÌÖÐϵͳËðʧµÄ»úеÄÜÊÇ
mgL£»
£¨3£©ºãÁ¦F×÷ÓÃʱ¼äÊÇ
£®
mg=m
V2 |
L |
µÃV=
gL |
ÉèСÇòÅöײºóËÙ¶ÈΪV1£¬ÆäºóÔÚ°ÚÖÁ×î¸ßµã¹ý³ÌÖУ¬»úеÄÜÊغ㣺
1 |
2 |
1 |
2 |
´úÈëVÖµ¿ÉµÃV1=
5gL |
Åöײ¹ý³ÌÖУ¬Îï¿éºÍСÇòϵͳ¶¯Á¿Êغ㣬ÓÐ
2mV0=mV1+2m?
V0 |
2 |
´úÈëV1Öµ¿ÉµÃV0=
5gL |
£¨2£©Åöײ¹ý³ÌÖÐϵͳËðʧµÄ»úеÄÜ
¡÷E=
1 |
2 |
1 |
2 |
V0 |
2 |
1 |
2 |
´úÈëËùÇó³öµÄËÙ¶ÈÖµ¿ÉµÃ
¡÷E=
5 |
4 |
£¨3£©Ð¡ÇòÔÚˮƽÃæÔ˶¯µÄ¼ÓËÙ¶Èa=
F |
2m |
ÓÉËٶȹ«Ê½V0=atµÃÁ¦F×÷ÓÃʱ¼ä
t=
V0 |
a |
2m
| ||
F |
´ð£º£¨1£©Ð¡Îï¿éÅöײǰËÙ¶ÈV0µÄ´óСÊÇ
5gL |
£¨2£©Åöײ¹ý³ÌÖÐϵͳËðʧµÄ»úеÄÜÊÇ
5 |
4 |
£¨3£©ºãÁ¦F×÷ÓÃʱ¼äÊÇ
2m
| ||
F |
µãÆÀ£º±¾Ìâ¹Ø¼üÃ÷È·¸÷¸öÔ˶¯¹ý³Ì£¬Ã÷ȷСÇòÓëСÎï¿éÅöײ¹ý³ÌÖÐϵͳ¶¯Á¿Êغ㣬ҪÇóͬѧÃÇÄÜÕýÈ·½øÐÐÊÜÁ¦£¬²¢ÄÜÁªÏëµ½ÒÑѧµÄÎïÀíÄ£ÐÍ£¬¸ù¾ÝÏà¹Ø¹«Ê½½âÌ⣮
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿