ÌâÄ¿ÄÚÈÝ
£¨10·Ö£©Ò»ÖÊÁ¿m£½0.5 kgµÄ»¬¿éÒÔÒ»¶¨µÄ³õËٶȳåÉÏÒ»Çã½Ç¦È=37¡ã×ã¹»³¤µÄбÃ棬ijͬѧÀûÓô«¸ÐÆ÷²â³öÁË»¬¿é³åÉÏбÃæ¹ý³ÌÖжà¸öʱ¿ÌµÄ˲ʱËٶȣ¬²¢ÓüÆËã»ú×ö³öÁËСÎï¿éÉÏ»¬¹ý³ÌµÄv-tͼÏó£¬ÈçͼËùʾ¡££¨×î´ó¾²Ä¦²ÁÁ¦µÈÓÚ»¬¶¯Ä¦²ÁÁ¦£¬È¡sin37¡ã=0.6£¬cos37¡ã=0.8£¬g="10" m/s2£©Çó£º
£¨1£©»¬¿éÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊý¡£
£¨2£©Åжϻ¬¿é×îºóÄÜ·ñ·µ»ØбÃæµ×¶Ë£¿ÈôÄÜ·µ»Ø£¬Çó³ö·µ»ØбÃæµ×¶ËʱµÄËٶȴóС£»Èô²»ÄÜ·µ»Ø£¬Çó³ö»¬¿éÍ£ÔÚʲôλÖá£
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241436164865824.jpg)
£¨1£©»¬¿éÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊý¡£
£¨2£©Åжϻ¬¿é×îºóÄÜ·ñ·µ»ØбÃæµ×¶Ë£¿ÈôÄÜ·µ»Ø£¬Çó³ö·µ»ØбÃæµ×¶ËʱµÄËٶȴóС£»Èô²»ÄÜ·µ»Ø£¬Çó³ö»¬¿éÍ£ÔÚʲôλÖá£
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241436164865824.jpg)
£¨1£©¦Ì=0.5£¨2£©v=
=
m/s
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143616502476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143616564382.png)
£¨1£© ÓÉͼÏó¿ÉÖª£¬»¬¿éµÄ¼ÓËÙ¶Èa=
=
m/s2="10" m/s2 £¨1·Ö£©
»¬¿é³åÉÏбÃæ¹ý³ÌÖиù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÓÐmgsin¦È+¦Ìmgcos¦È=ma £¨2·Ö£©
´úÈëÊý¾Ý½âµÃ¦Ì=0.5 £¨1·Ö£©
£¨2£© »¬¿éËٶȼõСµ½Áãʱ£¬ÖØÁ¦µÄÏ»¬·ÖÁ¦´óÓÚ×î´ó¾²Ä¦²ÁÁ¦£¬ÄÜÔÙÏ»¬£¨1·Ö£©
ÓÉÔȱäËÙÖ±ÏßÔ˶¯µÄ¹æÂÉ£¬»¬¿éÏòÉÏÔ˶¯µÄλÒÆs=
="5" m £¨1·Ö£©
»¬¿éÏ»¬¹ý³ÌÖиù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÓÐmgsin¦È-¦Ìmgcos¦È=ma2£¬a2="2" m/s2 £¨2·Ö£©
ÓÉÔȱäËÙÖ±ÏßÔ˶¯µÄ¹æÂÉ£¬»¬¿é·µ»Øµ×¶ËµÄËÙ¶Èv=
=
m/s £¨2·Ö£©
±¾Ì⿼²éËÙ¶ÈËÙ¶Èʱ¼äͼÏñºÍÅ£¶ÙµÚ¶þ¶¨ÂɵÄÓ¦Óã¬ÓÉͼÏñµÄбÂÊ¿ÉÇóµÃ¼ÓËٶȴóС£¬ÔÙÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÁÐʽ¿ÉÇóµÃ¶¯Ä¦²ÁÒòÊý´óС£¬ÓÉÔȱäËÙÖ±ÏßÔ˶¯¹«Ê½¿ÉÇóµÃÉÏÉýµÄ×î´ó¾àÀ룬Ï»¬¹ý³ÌÖÐÓÉÖØÁ¦ÑØбÃæÏòϵķÖÁ¦ºÍ»¬¶¯Ä¦²ÁÁ¦Ìṩ¼ÓËٶȣ¬ÔÙÓÉλÒÆÓëËٶȵĹØϵÇóµÃÄ©ËٶȴóС
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143616611335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143616658347.png)
»¬¿é³åÉÏбÃæ¹ý³ÌÖиù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÓÐmgsin¦È+¦Ìmgcos¦È=ma £¨2·Ö£©
´úÈëÊý¾Ý½âµÃ¦Ì=0.5 £¨1·Ö£©
£¨2£© »¬¿éËٶȼõСµ½Áãʱ£¬ÖØÁ¦µÄÏ»¬·ÖÁ¦´óÓÚ×î´ó¾²Ä¦²ÁÁ¦£¬ÄÜÔÙÏ»¬£¨1·Ö£©
ÓÉÔȱäËÙÖ±ÏßÔ˶¯µÄ¹æÂÉ£¬»¬¿éÏòÉÏÔ˶¯µÄλÒÆs=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143616705467.png)
»¬¿éÏ»¬¹ý³ÌÖиù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÓÐmgsin¦È-¦Ìmgcos¦È=ma2£¬a2="2" m/s2 £¨2·Ö£©
ÓÉÔȱäËÙÖ±ÏßÔ˶¯µÄ¹æÂÉ£¬»¬¿é·µ»Øµ×¶ËµÄËÙ¶Èv=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143616502476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143616564382.png)
±¾Ì⿼²éËÙ¶ÈËÙ¶Èʱ¼äͼÏñºÍÅ£¶ÙµÚ¶þ¶¨ÂɵÄÓ¦Óã¬ÓÉͼÏñµÄбÂÊ¿ÉÇóµÃ¼ÓËٶȴóС£¬ÔÙÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÁÐʽ¿ÉÇóµÃ¶¯Ä¦²ÁÒòÊý´óС£¬ÓÉÔȱäËÙÖ±ÏßÔ˶¯¹«Ê½¿ÉÇóµÃÉÏÉýµÄ×î´ó¾àÀ룬Ï»¬¹ý³ÌÖÐÓÉÖØÁ¦ÑØбÃæÏòϵķÖÁ¦ºÍ»¬¶¯Ä¦²ÁÁ¦Ìṩ¼ÓËٶȣ¬ÔÙÓÉλÒÆÓëËٶȵĹØϵÇóµÃÄ©ËٶȴóС
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿