ÌâÄ¿ÄÚÈÝ
ijͬѧ°´Èçͼ1°²×°ºÃÆ÷²Ä£¬½øÐÐʵÑ飬¼ÇÏÂСÇò´©¹ý¿¨Æ¬¿×µÄһϵÁÐλÖÃA¡¢B¡¢C¡¢D¡¢E£¨Í¼ÖÐδ±ê³ö£©£¬È¡Ï°×Ö½£¬·ÖÎö·¢ÏÖСÇòÅ׳öµãOûÓмÇÏ£¬ÓÚÊÇËûÓÃƽ»¬ÇúÏß½«A¡¢B¡¢C¡¢D¡¢EµãÁ¬ÆðÀ´²¢ÑÓ³¤µ½Ö½±ßÔµ£¬°ÑÅ×ÎïÏßÓëÖ½±ßÔµµÄ½»µã¶¨ÎªOµã£¬ÒÔOµãΪԵ㣬ÕýÈ·½¨Á¢×ø±êϵ£¬²â³öÇúÏßÉÏijµãµÄ×ø±êxºÍy£¬ÀûÓÃv0=
£¬Çó³öСÇòƽÅ׳õËÙ¶Èv0£®
£¨1£©¸Ã×°ÖÃÓÐÒ»´¦´íÎ󣬾ÍÊÇ
£¨2£©¼ÙÉè¸ÃͬѧÃè³öµÄСÇò×öƽÅ×Ô˶¯µÄ¹ì¼£ÊÇ׼ȷµÄ£¬ÓÉÓÚ×°ÖÃÉϵĴíÎ󣬴øÀ´ËûÕâÑù²âµÃµÄv0Öµ±ÈÕæʵֵ
£¨3£©ÈçͼËùʾ£¬ÔÚ¡°Ñо¿Æ½Å×ÎïÌåÔ˶¯¡±µÄʵÑéÖУ¬ÓÃÒ»ÕÅÓ¡ÓÐС·½¸ñµÄÖ½¼Ç¼¹ì¼££¬Ð¡·½¸ñµÄ±ß³¤L=1.25cm£®ÈôСÇòÔÚƽÅ×Ô˶¯Í¾Öеļ¸¸öλÖÃÈçͼ2ÖеÄa¡¢b¡¢c¡¢dËùʾ£¬ÔòСÇòƽÅ׵ijõËٶȵļÆËãʽΪv0=
|
£¨1£©¸Ã×°ÖÃÓÐÒ»´¦´íÎ󣬾ÍÊÇ
ÊúÖ±°åÉϵİ×Ö½×ó±ßԵûÓнô¿¿Ð±²ÛÄ©¶Ë
ÊúÖ±°åÉϵİ×Ö½×ó±ßԵûÓнô¿¿Ð±²ÛÄ©¶Ë
£»£¨2£©¼ÙÉè¸ÃͬѧÃè³öµÄСÇò×öƽÅ×Ô˶¯µÄ¹ì¼£ÊÇ׼ȷµÄ£¬ÓÉÓÚ×°ÖÃÉϵĴíÎ󣬴øÀ´ËûÕâÑù²âµÃµÄv0Öµ±ÈÕæʵֵ
Æ«´ó
Æ«´ó
£¨Ìî¡°Æ«´ó¡±¡°Æ«Ð¡¡±¡°ÏàµÈ¡±£©£®£¨3£©ÈçͼËùʾ£¬ÔÚ¡°Ñо¿Æ½Å×ÎïÌåÔ˶¯¡±µÄʵÑéÖУ¬ÓÃÒ»ÕÅÓ¡ÓÐС·½¸ñµÄÖ½¼Ç¼¹ì¼££¬Ð¡·½¸ñµÄ±ß³¤L=1.25cm£®ÈôСÇòÔÚƽÅ×Ô˶¯Í¾Öеļ¸¸öλÖÃÈçͼ2ÖеÄa¡¢b¡¢c¡¢dËùʾ£¬ÔòСÇòƽÅ׵ijõËٶȵļÆËãʽΪv0=
2
gl |
2
£¨ÓÃL¡¢g±íʾ£©£¬ÆäÖµÊÇgl |
0.7m/s
0.7m/s
£¨È¡g=9.8m/s2£©£¬Ð¡ÇòÔÚbµãµÄËÙÂÊÊÇ0.875m/s
0.875m/s
£®·ÖÎö£º£¨1£©¸ù¾ÝʵÑé×°Öð²×°µÄÒªÇó½øÐзÖÎö£®
£¨2£©¸ù¾Ý²âÁ¿³õËٶȵÄÔÀí£ºv0=
£¬¶øt=
£¬·ÖÎöyµÄÎó²î£¬¼´¿ÉÅжϳõËÙ¶Èv0µÄÎó²î£®
£¨3£©ÕýÈ·Ó¦ÓÃƽÅ×Ô˶¯¹æÂÉ£ºË®Æ½·½ÏòÔÈËÙÖ±ÏßÔ˶¯£¬ÊúÖ±·½Ïò×ÔÓÉÂäÌåÔ˶¯£¬¸ù¾Ý¡÷y=gT2Çó³öʱ¼äµ¥Î»T£®¶ÔÓÚˮƽ·½ÏòÓɹ«Ê½v0=
Çó³ö³õËٶȣ®ÓÉa¡¢c¼äÊúÖ±·½ÏòµÄλÒƺÍʱ¼äÇó³öbµãÊúÖ±·½ÏòµÄ·ÖËٶȣ¬ÔËÓÃËٶȵĺϳɣ¬Çó½âbµÄËÙÂÊ£®
£¨2£©¸ù¾Ý²âÁ¿³õËٶȵÄÔÀí£ºv0=
x |
t |
|
£¨3£©ÕýÈ·Ó¦ÓÃƽÅ×Ô˶¯¹æÂÉ£ºË®Æ½·½ÏòÔÈËÙÖ±ÏßÔ˶¯£¬ÊúÖ±·½Ïò×ÔÓÉÂäÌåÔ˶¯£¬¸ù¾Ý¡÷y=gT2Çó³öʱ¼äµ¥Î»T£®¶ÔÓÚˮƽ·½ÏòÓɹ«Ê½v0=
x |
t |
½â´ð£º½â£º£¨1£©±¾ÊµÑé²âÁ¿³õËٶȵÄÔÀíÊÇÀûÓÃƽÅ×Ô˶¯µÄ¹æÂÉ£º
ˮƽ·½Ïò£ºx=v0t
ÊúÖ±·½Ïò£ºy=
gt2
ÔòµÃ£¬v0=x
Õâ¸ö½áÂÛµÄÇ°ÌáÌõ¼þÊÇ£ºyÊÇÏà¶ÔÓÚÅ׳öµãÏÂÂäµÄ¸ß¶È£¬¸ù¾Ý´Ëͼ¿´³ö£¬¸Ã×°ÖÃÓÐÒ»´¦´íÎ󣬾ÍÊÇ£ºÊúÖ±°åÉϵİ×Ö½×ó±ßԵûÓнô¿¿Ð±²ÛÄ©¶Ë£¬ÕâÑù²»ÄÜ°×Ö½Éϵõ½Ð¡ÇòƽÅ×Ô˶¯µÄÆðµãÔÚ°×Ö½ÉϵÄͶӰ£¬´Ó¶ø»áÒýÆð½Ï´óµÄÎó²î£®
£¨2£©ÓÉÉÏ·ÖÎö¿ÉÖª£¬yµÄ²âÁ¿ÖµÆ«Ð¡£¬ËùÒÔ¸ù¾Ýv0=x
µÃÖª£¬v0Öµ±ÈÕæʵֵƫ´ó£®
£¨3£©ÉèÏàÁÚÁ½µã¼äµÄʱ¼ä¼ä¸ôΪT
ÊúÖ±·½Ïò£º2L-L=gT2£¬
µÃµ½£¬T=
ˮƽ·½Ïò£ºv0=
=2
´úÈëÊý¾Ý½âµÃ£¬v0=0.7m/s
bµãÊúÖ±·½Ïò·ÖËÙ¶Èvy=
=
bµãµÄËÙÂÊvb=
´úÈë½âµÃ£ºvb=0.875m/s
¹Ê´ð°¸Îª£º
£¨1£©ÊúÖ±°åÉϵİ×Ö½×ó±ßԵûÓнô¿¿Ð±²ÛÄ©¶Ë£»
£¨2£©Æ«´ó£»
£¨3£©2
£»0.7m/s£»0.875m/s£®
ˮƽ·½Ïò£ºx=v0t
ÊúÖ±·½Ïò£ºy=
1 |
2 |
ÔòµÃ£¬v0=x
|
Õâ¸ö½áÂÛµÄÇ°ÌáÌõ¼þÊÇ£ºyÊÇÏà¶ÔÓÚÅ׳öµãÏÂÂäµÄ¸ß¶È£¬¸ù¾Ý´Ëͼ¿´³ö£¬¸Ã×°ÖÃÓÐÒ»´¦´íÎ󣬾ÍÊÇ£ºÊúÖ±°åÉϵİ×Ö½×ó±ßԵûÓнô¿¿Ð±²ÛÄ©¶Ë£¬ÕâÑù²»ÄÜ°×Ö½Éϵõ½Ð¡ÇòƽÅ×Ô˶¯µÄÆðµãÔÚ°×Ö½ÉϵÄͶӰ£¬´Ó¶ø»áÒýÆð½Ï´óµÄÎó²î£®
£¨2£©ÓÉÉÏ·ÖÎö¿ÉÖª£¬yµÄ²âÁ¿ÖµÆ«Ð¡£¬ËùÒÔ¸ù¾Ýv0=x
|
£¨3£©ÉèÏàÁÚÁ½µã¼äµÄʱ¼ä¼ä¸ôΪT
ÊúÖ±·½Ïò£º2L-L=gT2£¬
µÃµ½£¬T=
|
ˮƽ·½Ïò£ºv0=
2L |
T |
gL |
´úÈëÊý¾Ý½âµÃ£¬v0=0.7m/s
bµãÊúÖ±·½Ïò·ÖËÙ¶Èvy=
L+2L |
2T |
3L |
2T |
bµãµÄËÙÂÊvb=
|
´úÈë½âµÃ£ºvb=0.875m/s
¹Ê´ð°¸Îª£º
£¨1£©ÊúÖ±°åÉϵİ×Ö½×ó±ßԵûÓнô¿¿Ð±²ÛÄ©¶Ë£»
£¨2£©Æ«´ó£»
£¨3£©2
gl |
µãÆÀ£º±¾ÌâÊÇƵÉÁÕÕƬÎÊÌ⣬ƵÉÁÕÕÏàÿ¸ôÒ»¶¨Ê±¼äÅÄÒ»´ÎÏ࣬¹Ø¼üÊÇץסÊúÖ±·½Ïò×ÔÓÉÂäÌåÔ˶¯µÄÌص㣬ÓÉ¡÷y=aT2Çóʱ¼äµ¥Î»£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿