ÌâÄ¿ÄÚÈÝ
£¨1£©ÔÚÀûÓôòµã¼ÆʱÆ÷ÑéÖ¤×ÔÓÉÏÂÂäÎïÌåµÄ»úеÄÜÊغãµÄʵÑéÖУ¬ÉèÔÚ´òOµãʱÊÍ·ÅÎïÌ壬´òµã¼ÆʱÆ÷´òAµãʱÎïÌåËÙ¶ÈΪv£¬OAÖ®¼äµÄ¾àÀëΪh£¬Ò»Í¬Ñ§ÔÚʵÑ鱨¸æÖгƣ¬Ëû²âµÃv=2.38m/s£¬h=28.76cm£¬¾Ý´Ë¿ÉµÃ£º
v2=2.832m2/s2£¬gh=2.818m2/s2£¬ÔÚÎó²îÔÊÐíµÄ·¶Î§ÄÚÁ½ÕßÏàµÈ£®µ«ÀÏʦÈÏΪÊý¾Ýʧʵ£¬ÆäÀíÓÉÊÇ
£¨2£©Ä³ÐËȤС×éΪ²â¶¨Ò»Ò£¿Øµç¶¯Ð¡³µµÄ¶î¶¨¹¦ÂÊ£¬½øÐÐÈçÏÂʵÑ飺
¢ÙÓÃÌìƽ²â³öµç¶¯Ð¡³µµÄÖÊÁ¿Îª1.0Kg£»
¢Ú½«µç¶¯Ð¡³µ¡¢Ö½´øºÍ´òµã¼ÆʱÆ÷°´ÈçÏÂͼËùʾ°²×°£»
¢Û½Óͨ´òµã¼ÆʱÆ÷£¨Æä´òµãÖÜÆÚΪ0.02s£©£»
¢Üʹµç¶¯Ð¡³µÒԶ¹¦ÂʼÓËÙÔ˶¯£¬´ïµ½×î´óËÙ¶ÈÒ»¶Îʱ¼äºó¹Ø±ÕС³µµçÔ´£¬´ýС³µ¾²Ö¹Ê±Ôٹرմòµã¼ÆʱÆ÷£¨ÉèÔÚÕû¸ö¹ý³ÌÖÐС³µËùÊܵÄ×èÁ¦ºã¶¨£©£®
ÔÚÉÏÊö¹ý³ÌÖУ¬´òµã¼ÆʱÆ÷ÔÚÖ½´øÉÏËù´òµÄ²¿·Öµã¼£ÈçÏÂͼÒÒËùʾ£®ÇëÄã·ÖÎöÖ½´øÊý¾Ý£¬»Ø´ðÏÂÃæÁ½¸öÎÊÌ⣺
£¨¢ñ£©µç¶¯Ð¡³µµÄ×î´óËÙ¶ÈΪ
£¨¢ò£©¸Ãµç¶¯Ð¡³µµÄ¶î¶¨¹¦ÂÊΪ
1 | 2 |
¿ÕÆø×èÁ¦¡¢Ä¦²ÁÓ°Ï춯ÄÜÔöÁ¿Ó¦ÂÔСÓÚÖØÁ¦ÊÆÄܼõÉÙÁ¿
¿ÕÆø×èÁ¦¡¢Ä¦²ÁÓ°Ï춯ÄÜÔöÁ¿Ó¦ÂÔСÓÚÖØÁ¦ÊÆÄܼõÉÙÁ¿
£®£¨2£©Ä³ÐËȤС×éΪ²â¶¨Ò»Ò£¿Øµç¶¯Ð¡³µµÄ¶î¶¨¹¦ÂÊ£¬½øÐÐÈçÏÂʵÑ飺
¢ÙÓÃÌìƽ²â³öµç¶¯Ð¡³µµÄÖÊÁ¿Îª1.0Kg£»
¢Ú½«µç¶¯Ð¡³µ¡¢Ö½´øºÍ´òµã¼ÆʱÆ÷°´ÈçÏÂͼËùʾ°²×°£»
¢Û½Óͨ´òµã¼ÆʱÆ÷£¨Æä´òµãÖÜÆÚΪ0.02s£©£»
¢Üʹµç¶¯Ð¡³µÒԶ¹¦ÂʼÓËÙÔ˶¯£¬´ïµ½×î´óËÙ¶ÈÒ»¶Îʱ¼äºó¹Ø±ÕС³µµçÔ´£¬´ýС³µ¾²Ö¹Ê±Ôٹرմòµã¼ÆʱÆ÷£¨ÉèÔÚÕû¸ö¹ý³ÌÖÐС³µËùÊܵÄ×èÁ¦ºã¶¨£©£®
ÔÚÉÏÊö¹ý³ÌÖУ¬´òµã¼ÆʱÆ÷ÔÚÖ½´øÉÏËù´òµÄ²¿·Öµã¼£ÈçÏÂͼÒÒËùʾ£®ÇëÄã·ÖÎöÖ½´øÊý¾Ý£¬»Ø´ðÏÂÃæÁ½¸öÎÊÌ⣺
£¨¢ñ£©µç¶¯Ð¡³µµÄ×î´óËÙ¶ÈΪ
1.50
1.50
m/s£¬£¨¢ò£©¸Ãµç¶¯Ð¡³µµÄ¶î¶¨¹¦ÂÊΪ
3.0
3.0
W£®·ÖÎö£º£¨1£©ÓÉÓÚÖØÎïÏ»¬¹ý³ÌÖÐÐèÒª¿Ë·þ×èÁ¦×ö¹¦£¬Òò´ËÖØÁ¦ÊÆÄܵļõСÁ¿ÂÔ´óÓÚ¶¯ÄܵÄÔö¼ÓÁ¿£®
£¨2£©×îºóÔÈËÙµÄËٶȱãÊÇС³µÒԶ¹¦ÂÊÔ˶¯µÄ×î´óËٶȣ¬Óɴ˸ù¾ÝÖ½´ø¿ÉÇó³öС³µ×î´óËٶȣ»Ð¡³µÔÚĦ²ÁÁ¦Á¦×÷ÓÃϼõËÙÔ˶¯£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ¿ÉÇó³öĦ²ÁÁ¦µÄ´óС£¬µ±Ð¡³µ´ïµ½¶î¶¨¹¦ÂÊʱÓУºP=Fv=fvm£¬¾Ý´Ë¿ÉÇó³ö¶î¶¨¹¦ÂÊ´óС£®
£¨2£©×îºóÔÈËÙµÄËٶȱãÊÇС³µÒԶ¹¦ÂÊÔ˶¯µÄ×î´óËٶȣ¬Óɴ˸ù¾ÝÖ½´ø¿ÉÇó³öС³µ×î´óËٶȣ»Ð¡³µÔÚĦ²ÁÁ¦Á¦×÷ÓÃϼõËÙÔ˶¯£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ¿ÉÇó³öĦ²ÁÁ¦µÄ´óС£¬µ±Ð¡³µ´ïµ½¶î¶¨¹¦ÂÊʱÓУºP=Fv=fvm£¬¾Ý´Ë¿ÉÇó³ö¶î¶¨¹¦ÂÊ´óС£®
½â´ð£º½â£º£¨1£©ÓÉÓÚ¿ÕÆø×èÁ¦¡¢Ä¦²ÁÓ°Ï춯ÄÜÔöÁ¿Ó¦ÂÔСÓÚÖØÁ¦ÊÆÄܼõÉÙÁ¿£¬¶ø¸ÃͬѧµÄ½áÂÛÊǶ¯ÄÜÔöÁ¿ÂÔ´óÓÚÖØÁ¦ÊÆÄܼõÉÙÁ¿£¬ËùÒÔÀÏʦÈÏΪÊý¾Ýʧʵ£®
£¨2£©¸ù¾ÝÖ½´ø¿ÉÖª£¬µ±Ëù´òµÄµãµã¾à¾ùÔÈʱ£¬±íʾÎïÌåÔÈËÙÔ˶¯£¬´ËʱËÙ¶È×î´ó£¬¹ÊÓУºvm=
=1.50m/s
´ÓÓҶ˿ªÊ¼È¡Áù¶ÎλÒÆ£¬
¸ù¾ÝÖð²î·¨ÓУºa=
=
cm/s2=210cm/s2=2.10m/s2£¬·½ÏòÓëÔ˶¯·½ÏòÏà·´£®
¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓУºf=ma£¬½«m=1.0kg´úÈ˵ãºf=2.1N£®
µ±Æû³µ´ïµ½¶î¶¨¹¦ÂÊ£¬ÔÈËÙÔ˶¯Ê±£¬F=f£¬P=Fv=fvm£¬
´úÈËÊý¾Ý½âµÃP=3.0W£®
¹Ê´ð°¸Îª£º£¨1£©¿ÕÆø×èÁ¦¡¢Ä¦²ÁÓ°Ï춯ÄÜÔöÁ¿Ó¦ÂÔСÓÚÖØÁ¦ÊÆÄܼõÉÙÁ¿
£¨2£©£¨¢ñ£© 1.50 £¨¢ò£© 3.0
£¨2£©¸ù¾ÝÖ½´ø¿ÉÖª£¬µ±Ëù´òµÄµãµã¾à¾ùÔÈʱ£¬±íʾÎïÌåÔÈËÙÔ˶¯£¬´ËʱËÙ¶È×î´ó£¬¹ÊÓУºvm=
x |
t |
´ÓÓҶ˿ªÊ¼È¡Áù¶ÎλÒÆ£¬
¸ù¾ÝÖð²î·¨ÓУºa=
¡÷x |
T2 |
(5.7+5.3+5.0)-(4.7+4.4+4.0) |
(3¡Á0.04)2 |
¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓУºf=ma£¬½«m=1.0kg´úÈ˵ãºf=2.1N£®
µ±Æû³µ´ïµ½¶î¶¨¹¦ÂÊ£¬ÔÈËÙÔ˶¯Ê±£¬F=f£¬P=Fv=fvm£¬
´úÈËÊý¾Ý½âµÃP=3.0W£®
¹Ê´ð°¸Îª£º£¨1£©¿ÕÆø×èÁ¦¡¢Ä¦²ÁÓ°Ï춯ÄÜÔöÁ¿Ó¦ÂÔСÓÚÖØÁ¦ÊÆÄܼõÉÙÁ¿
£¨2£©£¨¢ñ£© 1.50 £¨¢ò£© 3.0
µãÆÀ£º±¾Ì⿼²éÁ˹¦¡¢¹¦ÂÊÎÊÌâÔÚʵ¼ÊÖÐÓ¦Óã¬ÖªµÀÔÚƽֱ·ÃæÐÐÊ»µÄ³µ×Ó£¬¹¦ÂÊÒ»¶¨£¬µ±Ç£ÒýÁ¦Óë×èÁ¦ÏàµÈʱ£¬ËÙ¶È×î´ó£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿