ÌâÄ¿ÄÚÈÝ

¡¾ÌâÄ¿¡¿Ò»ÖÊÁ¿m=2.0kgµÄСÎï¿éÒÔÒ»¶¨µÄ³õËٶȳåÉÏÒ»Çã½Ç¦È=37¡ã×ã¹»³¤µÄ¹Ì¶¨Ð±Ã棬ijͬѧÀûÓô«¸ÐÆ÷²â³öÁËСÎï¿é´ÓÒ»¿ªÊ¼³åÉÏбÃæÖÁ×î¸ßµã¹ý³ÌÖжà¸öʱ¿ÌµÄ˲ʱËٶȣ¬²¢»æ³öÁËСÎï¿éÉÏ»¬¹ý³ÌÖÐËÙ¶ÈvËæʱ¼ätµÄ±ä»¯Í¼Ïñ£¬ÈçͼËùʾ¡£¼ÆËãʱȡsin37¡ã=0.6£¬cos37¡ã=0.8£¬m/s2¡£×î´ó¾²Ä¦²ÁÁ¦¿ÉÈÏΪµÈÓÚ»¬¶¯Ä¦²ÁÁ¦¡£

£¨1£©ÇóСÎï¿é³åÉÏбÃæ¹ý³ÌÖмÓËٶȵĴóСa¼°ÉÏ»¬µÄ×î´ó¾àÀëx£»

£¨2£©ÇóСÎï¿éÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì£»

£¨3£©Çë·ÖÎö˵Ã÷СÎï¿éÄÜ·ñ·µ»Ø³ö·¢µã¡£

¡¾´ð°¸¡¿£¨1£©8 m/s2£»4.0m£¨2£©0.25£¨3£©Äܹ»·µ»Ø³ö·¢µã

¡¾½âÎö¡¿

£¨1£©ÓÉͼÏñ¿ÉÖª

m/s2= 8 m/s2

СÎï¿éÑØбÃæÉÏ»¬µÄ×î´ó¾àÀëΪ

£¨2£©¶ÔСÎï¿é½øÐÐÊÜÁ¦·ÖÎö£¬ÈçͼËùʾ¡£

¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓÐ

mg sin37¡ã+f= ma

ÆäÖÐ

N= mg cos37¡ã

f=¦ÌN

´úÈëÊý¾Ý¿ÉµÃ

¦Ì=0.25

£¨3£©Ð¡Îï¿éÄÜ·µ»Ø³ö·¢µã¡£

ÒòΪµ±ËٶȼõΪÁãʱ£¬ÖØÁ¦µÄÏ»¬·ÖÁ¦

G1=mg sin37¡ã=12N

´ËʱµÄ×î´ó¾²Ä¦²ÁÁ¦

fmax =¦ÌN=¦Ìmg cos37¡ã=4N

ÓÉÓÚG1>fmax£¬ËùÒÔСÎï¿é½«ÑØбÃæÏòÏÂÔȼÓËÙÔ˶¯£¬Äܹ»·µ»Ø³ö·¢µã¡£

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø