ÌâÄ¿ÄÚÈÝ
ÔÚ¡°Ì½¾¿¼ÓËÙ¶ÈÓëÁ¦ºÍÖÊÁ¿µÄ¹Øϵ¡±ÊµÑéÖУº
£¨1£©ÒªÇóËù¹ÒСÅ̺͹³ÂëµÄ×ÜÖÊÁ¿______С³µºÍËù¼ÓíÀÂëµÄ×ÜÖÊÁ¿£¬´Ëʱ²ÅÄÜÈÏΪСÅ̺͹³ÂëËùÊÜÖØÁ¦´óСµÈÓÚÉþ¶ÔС³µµÄÀÁ¦´óС£»
£¨2£©Ä³Í¬Ñ§ÔÚƽºâĦ²ÁÁ¦Ê±°Ñľ°åµÄÒ»¶ËµæµÃ¹ý¸ß£¬ËùµÃµÄa-FͼÏóΪͼ1ÖеÄ______£»
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/2014061110045963810213.png)
£¨3£©¸Ãͬѧͨ¹ýÊý¾ÝµÄ´¦Àí×÷³öÁËa-FͼÏóÈçͼ2Ëùʾ£º
¢ÙͼÖеÄͼÏß²»¹ýÔµãµÄÔÒòÊÇ______£»
¢ÚͼÖÐͼÏßÉϲ¿·¢ÉúÍäÇúµÄÔÒòÊÇ______£®
£¨1£©ÒªÇóËù¹ÒСÅ̺͹³ÂëµÄ×ÜÖÊÁ¿______С³µºÍËù¼ÓíÀÂëµÄ×ÜÖÊÁ¿£¬´Ëʱ²ÅÄÜÈÏΪСÅ̺͹³ÂëËùÊÜÖØÁ¦´óСµÈÓÚÉþ¶ÔС³µµÄÀÁ¦´óС£»
£¨2£©Ä³Í¬Ñ§ÔÚƽºâĦ²ÁÁ¦Ê±°Ñľ°åµÄÒ»¶ËµæµÃ¹ý¸ß£¬ËùµÃµÄa-FͼÏóΪͼ1ÖеÄ______£»
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/2014061110045963810213.png)
£¨3£©¸Ãͬѧͨ¹ýÊý¾ÝµÄ´¦Àí×÷³öÁËa-FͼÏóÈçͼ2Ëùʾ£º
¢ÙͼÖеÄͼÏß²»¹ýÔµãµÄÔÒòÊÇ______£»
¢ÚͼÖÐͼÏßÉϲ¿·¢ÉúÍäÇúµÄÔÒòÊÇ______£®
£¨1£©ÒÔÕûÌåΪÑо¿¶ÔÏóÓÐmg=£¨m+M£©a
½âµÃa=
£¬
ÒÔMΪÑо¿¶ÔÏóÓÐÉþ×ÓµÄÀÁ¦F=Ma=
mg£¬
ÏÔȻҪÓÐF=mg±ØÓÐm+M=M£¬¹ÊÓÐM£¾£¾m£¬¼´Ö»ÓÐM£¾£¾mʱ²Å¿ÉÒÔÈÏΪÉþ¶ÔС³µµÄÀÁ¦´óСµÈÓÚÅ̺ÍÅÌÖÐíÀÂëµÄÖØÁ¦£®
£¨2£©Æ½ºâĦ²ÁÁ¦Ê±Ä¾°åµæµÃ¹ý¸ßÔòµ±ÀÁ¦FµÈÓÚ0ʱ£¬Ð¡³µÒѾ²úÉúÁ¦¼ÓËٶȣ¬Í¼ÏßÔÚaÖáÉÏÓнؾ࣬
¹ÊÑ¡C£®
£¨3£©¢Ùͼ2ÖÐͼÏóÓëºáÖáµÄ½Ø¾à´óÓÚ0£¬ËµÃ÷ÔÚÀÁ¦´óÓÚ0ʱ£¬¼ÓËٶȵÈÓÚ0£¬ËµÃ÷ÎïÌåËùÊÜÀÁ¦Ö®ÍâµÄÆäËûÁ¦µÄºÏÁ¦´óÓÚ0£¬¼´Ã»ÓÐƽºâĦ²ÁÁ¦»òƽºâĦ²ÁÁ¦²»×㣮
¢ÚͼÖÐͼÏßÉϲ¿·¢ÉúÍäÇúµÄÔÒòÊÇËæ×ÅFµÄÔö´ó²»ÔÙÂú×ã¹³ÂëµÄÖÊÁ¿Ô¶Ð¡ÓÚС³µÖÊÁ¿£®
¹Ê´ð°¸Îª£º£¨1£©Ô¶Ð¡ÓÚ£»£¨2£©C£»£¨3£©¢ÙδƽºâĦ²ÁÁ¦»òƽºâĦ²ÁÁ¦²»¹»£»¢ÚËæ×ÅFµÄÔö´ó²»ÔÙÂú×ã¹³ÂëµÄÖÊÁ¿Ô¶Ð¡ÓÚС³µÖÊÁ¿£»£¨
¼õС¼´
¼õС£»£©
½âµÃa=
mg |
M+m |
ÒÔMΪÑо¿¶ÔÏóÓÐÉþ×ÓµÄÀÁ¦F=Ma=
M |
m+M |
ÏÔȻҪÓÐF=mg±ØÓÐm+M=M£¬¹ÊÓÐM£¾£¾m£¬¼´Ö»ÓÐM£¾£¾mʱ²Å¿ÉÒÔÈÏΪÉþ¶ÔС³µµÄÀÁ¦´óСµÈÓÚÅ̺ÍÅÌÖÐíÀÂëµÄÖØÁ¦£®
£¨2£©Æ½ºâĦ²ÁÁ¦Ê±Ä¾°åµæµÃ¹ý¸ßÔòµ±ÀÁ¦FµÈÓÚ0ʱ£¬Ð¡³µÒѾ²úÉúÁ¦¼ÓËٶȣ¬Í¼ÏßÔÚaÖáÉÏÓнؾ࣬
¹ÊÑ¡C£®
£¨3£©¢Ùͼ2ÖÐͼÏóÓëºáÖáµÄ½Ø¾à´óÓÚ0£¬ËµÃ÷ÔÚÀÁ¦´óÓÚ0ʱ£¬¼ÓËٶȵÈÓÚ0£¬ËµÃ÷ÎïÌåËùÊÜÀÁ¦Ö®ÍâµÄÆäËûÁ¦µÄºÏÁ¦´óÓÚ0£¬¼´Ã»ÓÐƽºâĦ²ÁÁ¦»òƽºâĦ²ÁÁ¦²»×㣮
¢ÚͼÖÐͼÏßÉϲ¿·¢ÉúÍäÇúµÄÔÒòÊÇËæ×ÅFµÄÔö´ó²»ÔÙÂú×ã¹³ÂëµÄÖÊÁ¿Ô¶Ð¡ÓÚС³µÖÊÁ¿£®
¹Ê´ð°¸Îª£º£¨1£©Ô¶Ð¡ÓÚ£»£¨2£©C£»£¨3£©¢ÙδƽºâĦ²ÁÁ¦»òƽºâĦ²ÁÁ¦²»¹»£»¢ÚËæ×ÅFµÄÔö´ó²»ÔÙÂú×ã¹³ÂëµÄÖÊÁ¿Ô¶Ð¡ÓÚС³µÖÊÁ¿£»£¨
¡÷a |
¡÷F |
1 |
M |
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿