ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾÊÇÒ»ÖÖÆðÖØ»úµÄ¼òͼ£¬ÓÃËü°ÑÖÊÁ¿Îª4¡Á102kg £¬µ×Ãæ»ýΪ0.5m2µÄ»õÎïGÔÈËÙÌáÆð£¨g=10N/kg£©¡£Çó
£¨1£©ÆðµõÇ°£¬µ±»õÎï¾²Ö¹ÓëˮƽµØÃæʱ£¬Ëü¶ÔµØÃæµÄѹǿÊǶàÉÙ£¿
£¨2£©Èô°Ñ»õÎïÔÈËÙÌáÆð12m£¬ÓÃÁË40s£¬Ôò»õÎïÉÏÉýµÄËÙ¶ÈÊǶàÉÙ£¿
£¨3£©ÆðÖØ»ú¶Ô»õÎï×ö¹¦µÄ¹¦ÂÊÊǶàÉÙ£¿
£¨4£©ÈôOA=12m£¬OB=4m£¬ÆðÖØ»ú±¾ÉíÖØÁ¦²»¼Æ£¬µõÆð»õÎïʱΪʹÆðÖØ»ú²»·µ¹£¬ÆäÓÒ±ßÖÁÉÙÒªÅäÖÊÁ¿m0Ϊ¶àÉÙkgµÄÎïÌ壿
½â
£¨1£©¾²Ö¹ÓÚˮƽµØÃ棺
F=G=mg=4¡Á102kg¡Á10N/kg=4¡Á103N¡¡¡¡1·Ö
P=F/S=4¡Á103N/0.5m2=8¡Á103Pa ¡¡¡¡¡¡1·Ö
(2£©v=s/t=12m/40s=0.3m/s¡¡¡¡¡¡¡¡¡¡2·Ö
£¨3)W=Fs=4¡Á103N¡Á12m=4.8¡Á104J¡¡¡¡¡¡1·Ö
P=W/t=4.8¡Á104J/40s=1.2¡Á103W¡¡¡¡¡¡1·Ö
(4)ÓɸܸËƽºâÌõ¼þ£ºOA¡Ámg=OB¡Ám0g¡¡¡¡¡¡1·Ö
m0=OAm/OB=12m¡Á4¡Á102kg/4m=1.2¡Á103kg¡¡1·Ö
£¨ÆäËûÕýÈ·½â·¨£¬²ÎÕÕÉÏÊö±ê×¼¸ø·Ö£©