ÌâÄ¿ÄÚÈÝ
1£®Ä³ÐËȤС×éÒª²âÁ¿Ä¾¿éÓë½Ï´Ö²Úľ°åÖ®¼äµÄ¶¯Ä¦²ÁÒòÊý£¬ËûÃÇÏȽ«´Ö²Úľ°åˮƽ¹Ì¶¨£¬ÔÙÓÃÁíÒ»½Ï¹â»¬µÄ°å×ö³ÉбÃ棬Çãб°åÓëˮƽ°å¼äÓÉһС¶Î¹â»¬ÇúÃæÁ¬½Ó£¬±£Ö¤Ä¾¿éÔÚÁ½°å¼äͨ¹ýʱËٶȴóС²»±ä£®¢Ùʹľ¿é´Ó¸ßh´¦Óɾ²Ö¹»¬Ï£¬ÔÚˮƽ°åÉÏ»¬ÐÐxºóÍ£Ö¹Ô˶¯£¬¸Ä±äh´óС£¬½øÐжà´ÎʵÑ飬ÒÔhΪºá×ø±ê¡¢xΪ×Ý×ø±ê£¬´ÓÀíÂÛÉÏ£¨ºöÂÔľ¿éÓëÇãб°å¼äµÄĦ²Á£©µÃµ½µÄͼÏóӦΪ¹ý×ø±êÔµãµÄÒ»ÌõÖ±Ïߣ»
¢ÚÈç¹û¿¼Âǵ½Ä¾¿éÓëÇãб°åÖ®¼äµÄĦ²Á£¬ÔڸıähʱËûÃDzÉÈ¡µÄ°ì·¨ÊÇ£ºÃ¿´Î¸Ä±äÇãб°åµÄÇã½Ç£¬ÈÃľ¿éÿ´ÎÓɾ²Ö¹¿ªÊ¼Ï»¬µÄλÖÃÔÚÒ»ÌõÊúÖ±ÏßÉÏ£¬¶ÔÓ¦µÄµ×±ß³¤¶ÈΪL£¬Èçͼ1Ëùʾ£®½«Ã¿´ÎʵÑéµÃµ½µÄh¡¢xÏà¹ØÊý¾Ý»æÖƳöµÄx-hͼÏóÈçͼ2Ëùʾ£¬Í¼ÏßµÄÑÓ³¤ÏßÓëÁ½×ø±êÖáµÄ½»µã×ø±ê·Ö±ðΪ£¨a£¬0£©ºÍ£¨0£¬-b£©£¬Ôòľ¿éÓëÇãб°å¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì1=$\frac{a}{L}$£¬Ä¾¿éÓëˮƽ°å¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì2=$\frac{a}{b}$£®
·ÖÎö £¨1£©¸ù¾Ý¶¯Äܶ¨ÀíÁÐʽÇó½âxÓëhµÄ¹Øϵ±í´ïʽ£»
£¨2£©Ôٴθù¾Ý¶¯Äܶ¨ÀíÁÐʽ£¬µÃµ½x-hͼÏóµÄ±í´ïʽ£®
½â´ð ½â£º£¨1£©¶ÔÈ«³ÌÔËÓö¯Äܶ¨Àí£¬ÓУº
mgh-¦Ìmgx=0
µÃµ½£ºx=$\frac{1}{¦Ì}•h$
¹Êx-hͼÏóÊǹý×ø±êÔµãµÄÖ±Ïߣ¨»òÕý±ÈÀýº¯Êý£©£»
£¨2£©¶ÔÈ«³ÌÔËÓö¯Äܶ¨Àí£¬ÓУºmgh-¦Ì1mgcos¦È•x1-¦Ì2mgx=0£¨¦ÈΪбÃæµÄƽǣ©
Óɼ¸ºÎ¹ØϵµÃµ½£ºL=x1cos¦È
µÃµ½£ºx=$\frac{1}{{¦Ì}_{2}}h-\frac{{¦Ì}_{1}}{{¦Ì}_{2}}L$
ͼÏßµÄÑÓ³¤ÏßÓëÁ½×ø±êÖáµÄ½»µã×ø±ê·Ö±ðΪ£¨a£¬0£©ºÍ£¨0£¬-b£©£¬¹Ê£º$\frac{1}{{¦Ì}_{2}}$=$\frac{b}{a}$ £¨Ð±ÂÊ£©
-$\frac{{¦Ì}_{1}}{{¦Ì}_{2}}=-b$=-b £¨½Ø¾à£©
½âµÃ£º
¦Ì1=$\frac{a}{L}$
¦Ì2=$\frac{a}{b}$
¹Ê´ð°¸Îª£º¢Ù¹ý×ø±êÔµãµÄÒ»ÌõÖ±Ïß
¢Ú$\frac{a}{L}$£» $\frac{a}{b}$
µãÆÀ ±¾Ìâ¹Ø¼üÊÇÁ½´Î¸ù¾Ý¶¯Äܶ¨ÀíÁÐʽÇó½â³öx-hͼÏóµÄº¯Êý±í´ïʽ£¬È»ºó½áºÏͼÏó½øÐзÖÎö£¬²»ÄÑ£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
11£®ÔÚÕæ¿ÕÖÐijÇøÓòÓÐÒ»µç³¡£¬ÑØxÖá¸÷µãµÄµçÊƦշֲ¼ÈçͼËùʾ£¬ÇÒͼÖÐxÖá×ø±êx2=2x1£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | ÔÚxÖáÉÏox1¶ÎÓëx1x2¶Îµç³¡·½ÏòÏà·´ | |
B£® | x1´¦³¡Ç¿´óСΪ0 | |
C£® | ½«Ò»ÕýµçºÉÑØxÖá´Óx=0´¦ÒÆÖÁx=x2´¦µÄ¹ý³ÌÖУ¬µç³¡Á¦ÏÈ×öÕý¹¦£¬È»ºó×ö¸º¹¦£¬µ«×ܹ¦ÎªÁã | |
D£® | ½«Ò»¸ºµçºÉÑØxÖá´Óx=x2´¦ÒÆÖÁx=0´¦£¬µç³¡Á¦Ò»Ö±×öÕý¹¦ |
9£®Í¼£¨a£©ÎªÒ»Áмòгºá²¨ÔÚt=2sʱµÄ²¨ÐÎͼ£®Í¼£¨b£©ÎªÃ½ÖÊÖÐƽºâλÖÃÔÚx=1.5m´¦µÄÖʵãµÄÕñ¶¯Í¼Ïó£¬PÊÇƽºâλÖÃΪx=2mµÄÖʵ㣮ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | ²¨ËÙΪ0.5 m/s | B£® | ²¨µÄ´«²¥·½ÏòÏòÓÒ | ||
C£® | 0¡«2 sʱ¼äÄÚ£¬PÔ˶¯µÄ·³ÌΪ8 cm | D£® | 0¡«2 sʱ¼äÄÚ£¬PÏòyÖáÕý·½ÏòÔ˶¯ |
6£®Èçͼ£¬×ã¹»³¤´«ËÍ´øÓëˮƽÃæµÄ¼Ð½ÇΪ¦È£¬Îï¿éaͨ¹ýƽÐÐÓÚ´«ËÍ´øµÄÇáÉþ¿ç¹ý¹â»¬ÇỬÂÖÓëÎï¿ébÏàÁ¬£®¿ªÊ¼Ê±£¬a¡¢b¼°´«ËÍ´ø¾ù¾²Ö¹ÇÒmb£¾masin ¦È£®ÏÖʹ´«ËÍ´ø˳ʱÕëÔÈËÙת¶¯£¬ÔòÎï¿éÔÚÔ˶¯£¨Îï¿éδÓ뻬ÂÖÏàÅö£©¹ý³ÌÖУ¨¡¡¡¡£©
A£® | Ò»¶Îʱ¼äºó¿ÉÄÜÔÈËÙÔ˶¯ | |
B£® | Ò»¶Îʱ¼äºó£¬Ä¦²ÁÁ¦¶ÔÎï¿éa¿ÉÄÜ×ö¸º¹¦ | |
C£® | Ħ²ÁÁ¦¶Ôa¡¢b×é³ÉµÄϵͳ×öµÄ¹¦µÈÓÚa¡¢b»úеÄܵÄÔöÁ¿ | |
D£® | ¿ªÊ¼µÄÒ»¶Îʱ¼äÄÚ£¬ÖØÁ¦¶Ôa×ö¹¦µÄ¹¦ÂÊ´óÓÚÖØÁ¦¶Ôb×ö¹¦µÄ¹¦ÂÊ |
13£®ÏÂÁйØÓÚµçÔ´µÄ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | µçÔ´Êǽ«ÆäËûÐÎʽµÄÄÜת»¯ÎªµçÄܵÄ×°Öà | |
B£® | µçÔ´µÄ×÷ÓÃÊÇʹµçÔ´µÄÕý¸º¼«±£³ÖÒ»¶¨Á¿µÄÕý¡¢¸ºµçºÉ£¬Î¬³ÖÒ»¶¨µÄµçÊƲî | |
C£® | ÔÚµçÔ´ÄÚ²¿£¬´Ó¸º¼«µ½Õý¼«µçÊÆÖð½¥Ìá¸ß | |
D£® | ÓëµçÔ´ÏàÁ¬µÄµ¼ÏßÖеĵ糡ÊÇÓɵçÔ´Õý¡¢¸º¼«ÉϵĵçºÉÐÎ³ÉµÄ |
10£®ÎïÀíѧ¼Òͨ¹ýʵÑéÀ´Ì½¾¿ÎïÀí¹æÂÉ£¬ÎªÈËÀàµÄ¿ÆѧÊÂÒµ×ö³öÁ˾޴ó¹±Ï×£¬ÏÂÁзûºÏÎïÀíʷʵµÄÊÇ£¨¡¡¡¡£©
A£® | ¿ªÆÕÀÕÓÃÁË20Äêʱ¼ä¹Û²â¼Ç¼ÐÐÐǵÄÔ˶¯£¬·¢ÏÖÁËÐÐÐÇÔ˶¯µÄÈý´ó¶¨ÂÉ | |
B£® | °Â˹ÌØ·¢ÏÖÁ˵çÁ÷µÄ´ÅЧӦ£¬²¢Ìá³öÁ˵ç´Å¸ÐÓ¦¶¨ÂÉ | |
C£® | Å£¶Ù×öÁËÖøÃûµÄбÃæʵÑ飬µÃ³öÇáÖØÎïÌå×ÔÓÉÏÂÂäÒ»Ñù¿ìµÄ½áÂÛ | |
D£® | ·¨ÀµÚ²»½öÌá³öÁ˳¡µÄ¸ÅÄ¶øÇÒ·¢Ã÷ÁËÈËÀàÀúÊ·ÉϵĵÚһ̨·¢µç»ú |
11£®ÈçͼËùʾ£¬ÖÊÁ¿ÎªmµÄľ¿éÔÚÖÊÁ¿ÎªMµÄ³¤Ä¾°åÉÏÏòÓÒ»¬ÐУ¬Ä¾¿éÊܵ½ÏòÓÒµÄÀÁ¦FµÄ×÷Ó㬳¤Ä¾°å´¦ÓÚ¾²Ö¹×´Ì¬£¬ÒÑ֪ľ¿éÓ볤ľ°å¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì1£¬³¤Ä¾°åÓëµØÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì2£¬Ôò£¨¡¡¡¡£©
A£® | ³¤Ä¾°åÊܵ½µØÃæµÄĦ²ÁÁ¦µÄ´óСһ¶¨ÊÇF | |
B£® | ³¤Ä¾°åÊܵ½µØÃæµÄĦ²ÁÁ¦µÄ´óСһ¶¨ÊǦÌ2£¨m+M£©g | |
C£® | µ±F£¾¦Ì2£¨m+M£©gʱ£¬³¤Ä¾°å±ã»á¿ªÊ¼Ô˶¯ | |
D£® | ÎÞÂÛÔõÑù¸Ä±äFµÄ´óС£¬³¤Ä¾°å¶¼²»¿ÉÄÜÔ˶¯ |