ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬ÊÇÓðüÓа×Ö½µÄÖÊÁ¿Îª1.00kgµÄÔ²Öù°ôÌæ´úÖ½´øºÍÖØÎպÓÐÑÕÁϵÄë±Ê¹Ì¶¨Ôڵ綯»úµÄ·ÉÂÖÉϲ¢ËæÖ®ÔÈËÙת¶¯£¬ÒÔÌæ´ú´òµã¼ÆʱÆ÷£®ÉÕ¶ÏÐü¹ÒÔ²Öù°ôµÄÏߺó£¬Ô²Öù°ôÊúÖ±×ÔÓÉÏÂÂ䣬ë±Ê¾ÍÔÚÔ²Öù°ôÃæµÄÖ½ÉÏ»³ö¼ÇºÅ£¨ÈçͼÒÒËùʾ£©£®Éèë±Ê½Ó´¥°ôʱ²»Ó°Ïì°ôµÄÔ˶¯£¬²âµÃ¼ÇºÅÖ®¼äµÄ¾àÀëÈçͼ£¬ÓÉ´Ë¿ÉÑéÖ¤»úеÄÜÊغ㶨ÂÉ£®ÒÑÖªµç¶¯»úÃúÅÆÉϱêÓС°1200r/min¡±×ÖÑù£®¸ù¾ÝÒÔÉÏÄÚÈݻشðÏÂÁÐÎÊÌ⣮
¢Ùë±Ê»ÏàÁÚÁ½ÌõÏßµÄʱ¼ä¼ä¸ôT=________s£®°ôÏÂÂäµÄ¼ÓËÙ¶Èa=________m/s2
¢Ú¸ù¾ÝͼÒÒËù¸øµÄÊý¾Ý¿ÉÖª£ºÔÚë±Ê»Ï¼Ǻš°3¡±Ê±°ôÏÂÂäµÄ˲ʱËÙ¶Èv=________m/sÔÚë±Ê»Ï¼Ǻš°3µ½»Ï¼Ǻš°6¡±µÄÕâ¶Îʱ¼äÄÚ£¬°ôµÄ¶¯Äܵı仯Á¿Îª¡÷Ek=________J£®
0.05 9.6 2.2 2.24
·ÖÎö£º¢ÙÁ˽â¸ÃʵÑé×°ÖõÄÔÀí£¬ËüÀàËÆÓÚ´òµã¼ÆʱÆ÷£¬ÕºÓÐÑÕÁϵÄë±ÊËæµç¶¯»úתһȦ¾ÍÔÚÔ²Öù°ôÃæÉϵÄÖ½ÉÏ»³ö¼ÇºÅ£¬Õâ¾ÍÏñ´òµã¼ÆʱÆ÷ÿ¸ôÒ»¶¨Ê±¼ä¾Í´òÒ»¸öµã£®Êý¾ÝµÄ´¦Àí˼·Óë´òµã¼ÆʱÆ÷´ò³öÀ´µÄÖ½´ø´¦ÀíÒ»Ñù£®
¢ÚÀûÓÃÔȱäËÙÖ±ÏßÔ˶¯µÄÍÆÂÛ£¬¿É¼ÆËã³ö´ò³öijµãʱֽ´øÔ˶¯µÄ˲ʱËٶȣ¬´Ó¶øÇó³ö¶¯ÄÜ£®¸ù¾Ý¹¦ÄܹØϵµÃÖØÁ¦ÊÆÄܼõСÁ¿µÈÓÚÖØÁ¦×ö¹¦µÄÊýÖµ£®
½â´ð£º¢ÙÓÉÌâÒâ¿ÉÖª£¬µç¶¯»úµÄתËÙ£ºn=1200r/min=20r/s
¸Ãµç¶¯»úµÄÖÜÆÚΪ£ºT==0.05s£»
¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯µÄÍÆÂÛ¹«Ê½¡÷x=aT2¿ÉÒÔÇó³ö¼ÓËٶȵĴóС£¬
µÃ£ºx4-x1=3a1T2
x5-x2=3a2T2
x6-x3=3a3T2
ΪÁ˸ü¼Ó׼ȷµÄÇó½â¼ÓËٶȣ¬ÎÒÃǶÔÈý¸ö¼ÓËÙ¶Èȡƽ¾ùÖµ£º
´úÈëÊý¾Ý½âµÃ£ºa=9.6m/s2£®
¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯ÖÐʱ¼äÖеãµÄËٶȵÈÓڸùý³ÌÖеĵãµÄ˲ʱËٶȣ¬Òò´ËÓУº
¹Ê´ð°¸Îª£º¢Ù0.05£¬9.6£¬¢Ú2.2£¬2.24£®
µãÆÀ£ºÄܹ»ÖªµÀÏàÁڵļÆÊýµãÖ®¼äµÄʱ¼ä¼ä¸ô£¬ÀûÓÃÔȱäËÙÖ±ÏߵĹæÂÉÒÔ¼°ÍÆÂÛ½â´ðʵÑéÎÊÌâµÄÄÜÁ¦£¬ÔÚƽʱÁ·Ï°ÖÐÒª¼ÓÇ¿»ù´¡ÖªÊ¶µÄÀí½âÓëÓ¦Óã¬Ìá¸ß½â¾öÎÊÌâÄÜÁ¦£®
·ÖÎö£º¢ÙÁ˽â¸ÃʵÑé×°ÖõÄÔÀí£¬ËüÀàËÆÓÚ´òµã¼ÆʱÆ÷£¬ÕºÓÐÑÕÁϵÄë±ÊËæµç¶¯»úתһȦ¾ÍÔÚÔ²Öù°ôÃæÉϵÄÖ½ÉÏ»³ö¼ÇºÅ£¬Õâ¾ÍÏñ´òµã¼ÆʱÆ÷ÿ¸ôÒ»¶¨Ê±¼ä¾Í´òÒ»¸öµã£®Êý¾ÝµÄ´¦Àí˼·Óë´òµã¼ÆʱÆ÷´ò³öÀ´µÄÖ½´ø´¦ÀíÒ»Ñù£®
¢ÚÀûÓÃÔȱäËÙÖ±ÏßÔ˶¯µÄÍÆÂÛ£¬¿É¼ÆËã³ö´ò³öijµãʱֽ´øÔ˶¯µÄ˲ʱËٶȣ¬´Ó¶øÇó³ö¶¯ÄÜ£®¸ù¾Ý¹¦ÄܹØϵµÃÖØÁ¦ÊÆÄܼõСÁ¿µÈÓÚÖØÁ¦×ö¹¦µÄÊýÖµ£®
½â´ð£º¢ÙÓÉÌâÒâ¿ÉÖª£¬µç¶¯»úµÄתËÙ£ºn=1200r/min=20r/s
¸Ãµç¶¯»úµÄÖÜÆÚΪ£ºT==0.05s£»
¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯µÄÍÆÂÛ¹«Ê½¡÷x=aT2¿ÉÒÔÇó³ö¼ÓËٶȵĴóС£¬
µÃ£ºx4-x1=3a1T2
x5-x2=3a2T2
x6-x3=3a3T2
ΪÁ˸ü¼Ó׼ȷµÄÇó½â¼ÓËٶȣ¬ÎÒÃǶÔÈý¸ö¼ÓËÙ¶Èȡƽ¾ùÖµ£º
´úÈëÊý¾Ý½âµÃ£ºa=9.6m/s2£®
¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯ÖÐʱ¼äÖеãµÄËٶȵÈÓڸùý³ÌÖеĵãµÄ˲ʱËٶȣ¬Òò´ËÓУº
¹Ê´ð°¸Îª£º¢Ù0.05£¬9.6£¬¢Ú2.2£¬2.24£®
µãÆÀ£ºÄܹ»ÖªµÀÏàÁڵļÆÊýµãÖ®¼äµÄʱ¼ä¼ä¸ô£¬ÀûÓÃÔȱäËÙÖ±ÏߵĹæÂÉÒÔ¼°ÍÆÂÛ½â´ðʵÑéÎÊÌâµÄÄÜÁ¦£¬ÔÚƽʱÁ·Ï°ÖÐÒª¼ÓÇ¿»ù´¡ÖªÊ¶µÄÀí½âÓëÓ¦Óã¬Ìá¸ß½â¾öÎÊÌâÄÜÁ¦£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿