ÌâÄ¿ÄÚÈÝ
6£®ÈçͼËùʾ£¬Ë®Æ½´«ËÍ´øÓɵ綯»ú´ø¶¯£¬²¢Ê¼ÖÕ±£³ÖËÙ¶ÈvÔÈËÙÔ˶¯£¬ÏÖ½«×èÁ¦ÎªmµÄÎï¿éÎÞ³õËٶȷÅÔÚ´«ËÍ´øÉϵÄ×ó¶Ë£¬Ò»¶Îʱ¼äºóÎï¿éÓë´«ËÍ´øÏà¶Ô¾²Ö¹£¬¶ÔÓÚÕâÒ»¹ý³Ì£¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | Îï¿é»ñµÃµÄ¶¯ÄÜΪ$\frac{1}{2}$mv2 | |
B£® | Ħ²ÁÁ¦¶ÔÎï¿é×öµÄ¹¦Îª$\frac{1}{2}m{v}^{2}$ | |
C£® | ϵͳĦ²ÁÉúÈÈΪmv2 | |
D£® | ÓÉÓÚ·ÅÉÏСÎï¿éµç¶¯»ú¶à×öµÄ¹¦Îªmv2 |
·ÖÎö Ħ²ÁÁ¦¶ÔÎï¿é×ö¹¦µÈÓÚÎï¿é¶¯Äܵı仯£¬¸ù¾Ý¶¯Äܶ¨ÀíÇó½â£»ÓÉÓÚÎï¿éÓë´«ËÍ´ø¼äÓÐÏà¶ÔλÒÆ£¬Îï¿é¶Ô´«ËÍ´ø×ö¹¦Óë´«ËÍ´ø¶ÔÎï¿é×ö¹¦²¢²»ÏàµÈ£®ÏµÍ³Ä¦²ÁÉúÈȵÈÓÚϵͳ¿Ë·þĦ²ÁÁ¦×öµÄ×ܹ¦£®ÎïÌåÔÚ´«ËÍ´øÉÏÔ˶¯Ê±£¬ÎïÌåºÍ´«ËÍ´øÒª·¢ÉúÏà¶Ô»¬¶¯£¬ËùÒԵ綯»ú¶à×öµÄ¹¦Ò»²¿·Öת»¯³ÉÁËÎïÌåµÄ¶¯ÄÜÁíÒ»²¿·Ö¾ÍÊÇÔö¼ÓÁËÏàͬµÄÄÚÄÜ£®
½â´ð ½â£ºA¡¢ÓÉÌâÒâ¿ÉÖª£¬ÎïÌå×îÖÕËÙ¶ÈΪv£¬ÔòÎïÌ嶯ÄÜΪEK=$\frac{1}{2}$mv2£»¹ÊAÕýÈ·£»
B¡¢Îï¿éÔ˶¯¹ý³ÌÖУ¬Ö»ÓÐĦ²ÁÁ¦¶ÔËü×ö¹¦£¬¸ù¾Ý¶¯Äܶ¨ÀíµÃ£ºÄ¦²ÁÁ¦¶ÔÎï¿é×öµÄ¹¦ÎªWf=$\frac{1}{2}$mv2-0=$\frac{1}{2}$mv2£®¹ÊBÕýÈ·£®
C¡¢ÉèÎï¿éÔȼÓËÙÔ˶¯µÄʱ¼äΪt£¬ÔòÎï¿éÓë´«ËÍ´øÏà¶ÔλÒÆ´óСΪ¡÷x=vt-$\frac{1}{2}$vt=$\frac{1}{2}$vt£¬´Ë¹ý³ÌÖÐÎï¿éµÄλÒÆΪxÎï=$\frac{1}{2}$vt=$\frac{1}{2}$vt£¬ÔòÓС÷x=xÎÔòϵͳĦ²ÁÉúÈÈΪQ=f•¡÷x=fxÎï=$\frac{1}{2}$mv2£®¹ÊC´íÎó£®
D¡¢µç¶¯»ú¶à×öµÄ¹¦×ª»¯³ÉÁËÎïÌåµÄ¶¯ÄܺÍϵͳµÄÄÚÄÜ£¬ËùÒԵ綯»ú¶à×öµÄ¹¦ÎªW»ú=$\frac{1}{2}$mv2+Q=mv2£®¹ÊDÕýÈ·£®
¹ÊÑ¡£ºABD
µãÆÀ ½â¾ö±¾ÌâµÄ¹Ø¼üÖªµÀÎï¿éÏÈÊÜ»¬¶¯Ä¦²ÁÁ¦ºó²»ÊÜĦ²ÁÁ¦£®ÏµÍ³Ä¦²ÁÉúÈÈÓ¦¸ù¾ÝÏà¶ÔλÒÆ¡÷xÇó½â£¬×¢ÒâÕýÈ·Ñ¡ÔñÑо¿¶ÔÏó£¬Ã÷È·¶¯Äܶ¨ÀíµÄ׼ȷӦÓü´¿ÉÕýÈ·Çó½â£®
A£® | Ñо¿¡°ÉñÖ۰˺š±ÈƵØÇòµÄÔ˶¯Ê±£¬¡°ÉñÖ۰˺š±¿É¿´×÷Öʵã | |
B£® | Ñо¿¡°ÉñÖ۰˺š±ÓëÌ칬һºÅ¶Ô½Óʱ£¬¡°ÉñÖ۰˺š±¿É¿´×÷Öʵã | |
C£® | ¡°ÉñÖ۰˺š±ÈƵØÇòÔËÐÐÒ»ÖÜ£¬ËüµÄλÒÆ´óСÓë·³ÌÏàµÈ | |
D£® | ÌâÖеġ°1 ʱ 36 ·Ö¡±ÊÇָʱ¼ä¼ä¸ô |
A£® | µ±FÖð½¥Ôö¼Ó1Nʱ£¨ÇáÉþδ¶Ï£©£¬ÇáÉþÖÐÀÁ¦Ôö¼Ó0.5N | |
B£® | µ±FÖð½¥Ôö´óµ½Tʱ£¬ÇáÉþ¸ÕºÃ±»À¶Ï | |
C£® | µ±FÖð½¥Ôö´óµ½1.5Tʱ£¬ÇáÉþ»¹²»»á±»À¶Ï | |
D£® | ÇáÉþ¸ÕÒª±»À¶Ïʱ£¬ÖÊÁ¿ÎªmºÍ2mµÄľ¿é¼äµÄĦ²ÁÁ¦Îª$\frac{2}{3}$T |
A£® | Bľ¿éµÄ¼ÓËÙ¶Èa2=2m/s2 | B£® | Bľ¿éµÄÖÊÁ¿m2=2kg | ||
C£® | Bľ¿éµÄÖÊÁ¿m2=18kg | D£® | ¾¹ýʱ¼ä2s£¬Aľ¿éͨ¹ýµÄ¾àÀëÊÇ1m |
A£® | ÇúÏßÔ˶¯¿ÉÄÜÊÇÔÈËÙÔ˶¯ | |
B£® | ÇúÏßÔ˶¯Ëٶȵķ½Ïò²»¶ÏµÄ±ä»¯£¬µ«ËٶȵĴóС¿ÉÒÔ²»±ä | |
C£® | ÇúÏßÔ˶¯µÄËٶȷ½Ïò¿ÉÄܲ»±ä | |
D£® | ÇúÏßÔ˶¯µÄËٶȴóСºÍ·½ÏòÒ»¶¨Í¬Ê±¸Ä±ä |
A£® | ÖØÁ¦¶ÔAÇò×ö¹¦µÄƽ¾ù¹¦ÂÊСЩ | |
B£® | ÖØÁ¦¶ÔA¡¢BÁ½Çò×ö¹¦µÄƽ¾ù¹¦ÂÊÏàͬ | |
C£® | ÂäµØʱBÇòµÄÖØÁ¦Ë²Ê±¹¦Âʽϴó | |
D£® | ÂäµØʱA¡¢BÁ½ÇòµÄÖØÁ¦Ë²Ê±¹¦ÂÊÏàµÈ |
A£® | ÎïÌåAÏà¶ÔµØÃæ×öÇúÏßÔ˶¯ | B£® | ÎïÌåAÏà¶ÔµØÃæ×öÖ±ÏßÔ˶¯ | ||
C£® | TÒ»¶¨´óÓÚmg | D£® | TµÈÓÚmg |
A£® | ¼×ËùÊܺÏÁ¦µÄ´óСһ¶¨ÒÒµÄÁ½±¶ | |
B£® | ¾ÏàµÈµÄʱ¼ät£¬¼×µÄËٶȴóСһ¶¨ÊÇÒÒµÄÁ½±¶ | |
C£® | µ±Á½Öʵ㷢ÉúµÄλÒƾùΪ¡÷xʱ£¬¼×µÄËٶȴóСһ¶¨ÊÇÒÒµÄÁ½±¶ | |
D£® | ÔÚÁ½Öʵ㷢ÉúµÄλÒƾùΪ¡÷xµÄ¹ý³ÌÖУ¬¼×Êܵ½µÄºÏÁ¦×öµÄ¹¦Ò»¶¨ÊÇÒÒÊܵ½µÄºÏÁ¦×öµÄ¹¦µÄÁ½±¶ |