ÌâÄ¿ÄÚÈÝ
ÔÚ¡°Ì½¾¿Ð¡³µËÙ¶ÈËæʱ¼ä±ä»¯¹æÂÉ¡±µÄʵÑéÖУ¬Ä³Í¬Ñ§²âÁ¿Êý¾Ýºó£¬Í¨¹ý¼ÆËãµ½ÁËС³µÔ˶¯¹ý³ÌÖи÷¼Æʱʱ¿ÌµÄËÙ¶ÈÈç±í¸ñËùʾ£º
Òò´Ë´ÎʵÑéµÄÔʼֽ´øûÓб£´æ£¬ÁíһͬѧÏë¹ÀËãС³µ´ÓλÖÃ0µ½Î»ÖÃ5µÄλÒÆ£¬ÆäËùÓ÷½·¨Êǽ«Ã¿¸ö0.1sÊÓΪÔÈËÙÔ˶¯£¬È»ºó¹ÀËãÈçÏ£º
x=£¨0.38¡Á0.1+0.63¡Á0.1+0.88¡Á0.1+1.12¡Á0.1+1.38¡Á0.1£©ÄÇô£¬¸ÃͬѧµÃµ½µÄλÒÆ
λÖñàºÅ | 0 | 1 | 2 | 3 | 4 | 5 |
ʱ¼ät/s | 0 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
ËÙ¶Èv/m?s-1 | 0.38 | 0.63 | 0.88 | 1.12 | 1.38 | 1.63 |
x=£¨0.38¡Á0.1+0.63¡Á0.1+0.88¡Á0.1+1.12¡Á0.1+1.38¡Á0.1£©ÄÇô£¬¸ÃͬѧµÃµ½µÄλÒÆ
СÓÚ
СÓÚ
£®£¨Ñ¡Ìî¡°´óÓÚ¡±¡¢¡°µÈÓÚ¡±»ò¡°Ð¡ÓÚ¡±£©Êµ¼ÊλÒÆ£¬ÎªÁËʹ¼ÆËãλÒƵÄÎó²î¾¡¿ÉÄÜС£¬ÄãÈÏΪ²Éȡʲô·½·¨¸üºÏÊÊ£¬ÎªÊ²Ã´£¿£¨²»±ØËã³ö¾ßÌåÊý¾Ý£©¿ÉÒÔÏȼÆËãÏàÁÚλÖüäµÄƽ¾ùËٶȣ¬Ôٵõ½Î»ÒÆ£¬ÕâÊÇÒòΪ±íÖÐÿ¸ô0.1sµÄËÙ¶ÈÔö¼ÓÔÚÎó²î·¶Î§ÄÚÏàͬ£¬¼´ÎªÔȱäËÙÖ±ÏßÔ˶¯£¬Æ½¾ùËٶȿÉÒÔÓɹ«Ê½
=
Çó³ö£¬»¹¿ÉÒÔÇó³ö¼ÓËٶȣ¬Ó¦ÓÃÔȱäËÙÖ±ÏßÔ˶¯¹«Ê½x=v0t+
at2µÃ³öλÒÆ£®
. |
v |
v1+v2 |
2 |
1 |
2 |
¿ÉÒÔÏȼÆËãÏàÁÚλÖüäµÄƽ¾ùËٶȣ¬Ôٵõ½Î»ÒÆ£¬ÕâÊÇÒòΪ±íÖÐÿ¸ô0.1sµÄËÙ¶ÈÔö¼ÓÔÚÎó²î·¶Î§ÄÚÏàͬ£¬¼´ÎªÔȱäËÙÖ±ÏßÔ˶¯£¬Æ½¾ùËٶȿÉÒÔÓɹ«Ê½
=
Çó³ö£¬»¹¿ÉÒÔÇó³ö¼ÓËٶȣ¬Ó¦ÓÃÔȱäËÙÖ±ÏßÔ˶¯¹«Ê½x=v0t+
at2µÃ³öλÒÆ£®
£®. |
v |
v1+v2 |
2 |
1 |
2 |
·ÖÎö£º¸ù¾ÝС³µÔ˶¯¹ý³ÌÖи÷¼Æʱʱ¿ÌµÄËٶȴóС£¬µÃ³öÏàµÈµÄʱ¼äÄÚËٶȱ仯¼¸ºõÏàͬ£¬Òò´Ë¿ÉÒÔÈÏΪС³µ×öÔȼÓËÙÖ±ÏßÔ˶¯£¬ÈôÓÃÒ»¶Îʱ¼ä¿ªÊ¼µÄËٶȴúÌæƽ¾ùËÙ¶ÈÀ´ÇóλÒÆ£¬Ò»¶¨»áµ¼ÖÂλÒƱäС£¬Èô¸ù¾ÝÔȼÓËÙÖ±ÏßÔ˶¯µÄ¹æÂÉÇó³öƽ¾ùËÙ¶ÈÔÙÇó³öλÒÆÔò¸ü׼ȷ£®
½â´ð£º½â£ºÐ¡³µ×öÔȼÓËÙÖ±ÏßÔ˶¯£¬0-0.1sÄÚµÄƽ¾ùËٶȴóÓÚ¿ªÊ¼Ê±¿ÌµÄËÙ¶È0.38m/s£¬
Òò´Ëʵ¼ÊλÒÆÓ¦¸Ã´óÓÚ0.38¡Á0.1£¬
ÒÀ´ËÀàÍÆ0-0.4sʵ¼ÊλÒÆÓ¦¸Ã´óÓÚ0.38¡Á0.1+0.63¡Á0.1+0.88¡Á0.1+1.12¡Á0.1+1.38¡Á0.1£¬
ËùÒÔ¸ÃͬѧµÃµ½µÄλÒÆСÓÚʵ¼ÊλÒÆ£®
¿ÉÒÔÏȼÆËãÏàÁÚλÖüäµÄƽ¾ùËٶȣ¬Ôٵõ½Î»ÒÆ£¬ÕâÊÇÒòΪ±íÖÐÿ¸ô0.1sµÄËÙ¶ÈÔö¼ÓÔÚÎó²î·¶Î§ÄÚÏàͬ£¬
¼´ÎªÔȱäËÙÖ±ÏßÔ˶¯£¬
ƽ¾ùËٶȿÉÒÔÓɹ«Ê½
=
Çó³ö£¬»¹¿ÉÒÔÇó³ö¼ÓËٶȣ¬
Ó¦ÓÃÔȱäËÙÖ±ÏßÔ˶¯¹«Ê½x=v0t+
at2µÃ³öλÒÆ£®
¹Ê´ð°¸Îª£ºÐ¡ÓÚ£¬¿ÉÒÔÏȼÆËãÏàÁÚλÖüäµÄƽ¾ùËٶȣ¬Ôٵõ½Î»ÒÆ£¬ÕâÊÇÒòΪ±íÖÐÿ¸ô0.1sµÄËÙ¶ÈÔö¼ÓÔÚÎó²î·¶Î§ÄÚÏàͬ£¬¼´ÎªÔȱäËÙÖ±ÏßÔ˶¯£¬Æ½¾ùËٶȿÉÒÔÓɹ«Ê½
=
Çó³ö£¬»¹¿ÉÒÔÇó³ö¼ÓËٶȣ¬Ó¦ÓÃÔȱäËÙÖ±ÏßÔ˶¯¹«Ê½x=v0t+
at2µÃ³öλÒÆ£®
Òò´Ëʵ¼ÊλÒÆÓ¦¸Ã´óÓÚ0.38¡Á0.1£¬
ÒÀ´ËÀàÍÆ0-0.4sʵ¼ÊλÒÆÓ¦¸Ã´óÓÚ0.38¡Á0.1+0.63¡Á0.1+0.88¡Á0.1+1.12¡Á0.1+1.38¡Á0.1£¬
ËùÒÔ¸ÃͬѧµÃµ½µÄλÒÆСÓÚʵ¼ÊλÒÆ£®
¿ÉÒÔÏȼÆËãÏàÁÚλÖüäµÄƽ¾ùËٶȣ¬Ôٵõ½Î»ÒÆ£¬ÕâÊÇÒòΪ±íÖÐÿ¸ô0.1sµÄËÙ¶ÈÔö¼ÓÔÚÎó²î·¶Î§ÄÚÏàͬ£¬
¼´ÎªÔȱäËÙÖ±ÏßÔ˶¯£¬
ƽ¾ùËٶȿÉÒÔÓɹ«Ê½
. |
v |
v1+v2 |
2 |
Ó¦ÓÃÔȱäËÙÖ±ÏßÔ˶¯¹«Ê½x=v0t+
1 |
2 |
¹Ê´ð°¸Îª£ºÐ¡ÓÚ£¬¿ÉÒÔÏȼÆËãÏàÁÚλÖüäµÄƽ¾ùËٶȣ¬Ôٵõ½Î»ÒÆ£¬ÕâÊÇÒòΪ±íÖÐÿ¸ô0.1sµÄËÙ¶ÈÔö¼ÓÔÚÎó²î·¶Î§ÄÚÏàͬ£¬¼´ÎªÔȱäËÙÖ±ÏßÔ˶¯£¬Æ½¾ùËٶȿÉÒÔÓɹ«Ê½
. |
v |
v1+v2 |
2 |
1 |
2 |
µãÆÀ£º¿¼²éÁËÀûÓÃÔȱäËÙÖ±ÏßÔ˶¯µÄ¹æÂɺÍÍÆÂÛ½â¾öÎÊÌâµÄÄÜÁ¦£¬ÓÈÆäÊǹ«Ê½
=
µÄÀí½âºÍÓ¦Óã¬ÐèÒª¼ÓÇ¿Á·Ï°£®
. |
v |
v1+v2 |
2 |
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
ÔÚ̽¾¿Ð¡³µËÙ¶ÈËæʱ¼ä±ä»¯¹æÂɵÄʵÑéÖУ¬ÈçͼËùʾ£¬¹ØÓÚʹÓòÙ×÷£¬ÏÂÁÐ˵·¨ÖдíÎóµÄÊÇ£¨¡¡¡¡£©
A¡¢´òµã¼ÆʱÆ÷²»Ò»¶¨ÒªÊ¹Óý»Á÷µç | B¡¢ÔÚÊÍ·ÅС³µÇ°£¬Ð¡³µÓ¦½ô°¤ÔÚ´òµã¼ÆʱÆ÷ÅÔ | C¡¢Ó¦ÏȽÓͨµçÔ´£¬´ý´òµã¼ÆʱÆ÷¿ªÊ¼´òµãºóÔÙÊÍ·ÅС³µ | D¡¢ÒªÔÚС³µµ½´ï¶¨»¬ÂÖǰʹС³µÍ£Ö¹Ô˶¯ |