ÌâÄ¿ÄÚÈÝ
![](http://thumb.1010pic.com/pic3/upload/images/201309/108/f539ad8a.png)
£¨1£©ÒÒÎïÌåºÍ¼×ÎïÌåÅöײ¹ý³ÌÖÐËðʧµÄ¶¯ÄÜ£»
£¨2£©ÒÒÎïÌåºÍ¼×ÎïÌåÅöײºóÒ»ÆðÏòÏÂÔ˶¯ÖÁ×îµÍµãµÄ¹ý³ÌÖУ¬ÒÒÎïÌåºÍ¼×ÎïÌå¿Ë·þµ¯»Éµ¯Á¦Ëù×öµÄ¹¦£®
·ÖÎö£º¶ÔÓÚÒÒÎïÌåºÍ¼×ÎïÌåÅöײǰºó£¬ÎÒÃÇ¿ÉÒÔÈÏΪϵͳ¶¯Á¿Êغ㣮
Çó³öÒÒÎïÌåºÍ¼×ÎïÌåÅöײǰºóµÄϵͳ¶¯ÄÜ£¬Çó³öÒÒÎïÌåºÍ¼×ÎïÌåÅöײ¹ý³ÌÖÐËðʧµÄ¶¯ÄÜ£®
ÓÉÓÚ¿ÕÆø×èÁ¦¿ÉºöÂÔ²»¼Æ£¬ËùÒԼ׺ÍÒÒÅöײºó×ö¼òгÔ˶¯£¬¸ù¾ÝƽºâλÖÃʱµÄÌصãÇó³öµ¯»ÉѹËõÁ¿£®
¸ù¾Ý¶¯Äܶ¨ÀíÑо¿¼×ºÍÒÒÅöײºóµ½×îµÍµãµÄ¹ý³Ì£¬Çó³ö¿Ë·þµ¯»Éµ¯Á¦Ëù×öµÄ¹¦£®
Çó³öÒÒÎïÌåºÍ¼×ÎïÌåÅöײǰºóµÄϵͳ¶¯ÄÜ£¬Çó³öÒÒÎïÌåºÍ¼×ÎïÌåÅöײ¹ý³ÌÖÐËðʧµÄ¶¯ÄÜ£®
ÓÉÓÚ¿ÕÆø×èÁ¦¿ÉºöÂÔ²»¼Æ£¬ËùÒԼ׺ÍÒÒÅöײºó×ö¼òгÔ˶¯£¬¸ù¾ÝƽºâλÖÃʱµÄÌصãÇó³öµ¯»ÉѹËõÁ¿£®
¸ù¾Ý¶¯Äܶ¨ÀíÑо¿¼×ºÍÒÒÅöײºóµ½×îµÍµãµÄ¹ý³Ì£¬Çó³ö¿Ë·þµ¯»Éµ¯Á¦Ëù×öµÄ¹¦£®
½â´ð£º½â£º£¨1£©ÉèÒÒÎïÌåºÍ¼×ÎïÌåÅöײǰ˲¼äÒÒÎïÌåµÄËٶȴóСΪv1£¬¸ù¾Ýv12=2gh
½âµÃ£ºv1=2
m/s=2.8m/s
ÉèÒÒÎïÌåºÍ¼×ÎïÌåÅöײºóµÄ¹²Í¬ËٶȴóСΪv2£¬Óɶ¯Á¿Êغ㶨ÂÉÓÐmv1=2mv2
½âµÃv2=
v1=
m/s=1.4m/s
ËùÒÔÅöײºóϵͳµÄ¶¯ÄÜEk2=
£¨2m£©v22=2J
ÒòΪ¼×¡¢ÒÒÎïÌå¹¹³ÉµÄϵͳÅöײǰµÄ¶¯ÄÜEk1=4J£¬ËùÒÔÒÒÎïÌåºÍ¼×ÎïÌåÅöײ¹ý³ÌÖÐËðʧµÄ»úеÄÜ¡÷E=Ek1-Ek2=2J
£¨2£©Éè¼×ÎïÌ徲ֹʱµ¯»ÉѹËõÁ¿Îªx1£¬
¸ù¾ÝƽºâÌõ¼þ£¬½âµÃx1=
=5.0cm
¼×ºÍÒÒÅöײºó×ö¼òгÔ˶¯£¬ÔÚͨ¹ýƽºâλÖÃʱÁ½ÎïÌåËùÊܺÏÁ¦ÎªÁ㣬ËÙ¶È×î´ó£¬Éè´Ëʱµ¯»ÉѹËõÁ¿Îªx2£¬
½âµÃ£ºx2=
=10cm
¼×ÎïÌåºÍÒÒÎïÌåһͬÉÏÉýµ½×î¸ßµãʱ£¬Á½ÎïÌåÓë¼òгÔ˶¯Æ½ºâλÖõľàÀ룬¼´¼òгÔ˶¯µÄÕñ·ùA=x2+£¨H-x1£©=15cm
¸ù¾Ý¼òгÔ˶¯µÄ¶Ô³ÆÐÔ¿ÉÖª£¬Á½ÎïÌåÏòÏÂÔ˶¯µÄ¾àÀëx=A+£¨x2-x1£©=20 cm
ÉèÁ½ÎïÌåÏòÏÂÔ˶¯ÖÁ×îµÍµãµÄ¹ý³ÌÖУ¬¿Ë·þµ¯»Éµ¯Á¦×ö¹¦ÎªW£¬
¸ù¾Ý¶¯Äܶ¨ÀíÑо¿¼×ºÍÒÒÅöײºóµ½×îµÍµãµÄ¹ý³ÌÓУº
2mgx-W=0-
2mv22½âµÃW=6.0J
´ð£º£¨1£©ÒÒÎïÌåºÍ¼×ÎïÌåÅöײ¹ý³ÌÖÐËðʧµÄ¶¯ÄÜΪ2J£»
£¨2£©ÒÒÎïÌåºÍ¼×ÎïÌå¿Ë·þµ¯»Éµ¯Á¦Ëù×öµÄ¹¦Îª6.0J£®
½âµÃ£ºv1=2
2 |
ÉèÒÒÎïÌåºÍ¼×ÎïÌåÅöײºóµÄ¹²Í¬ËٶȴóСΪv2£¬Óɶ¯Á¿Êغ㶨ÂÉÓÐmv1=2mv2
½âµÃv2=
1 |
2 |
2 |
ËùÒÔÅöײºóϵͳµÄ¶¯ÄÜEk2=
1 |
2 |
ÒòΪ¼×¡¢ÒÒÎïÌå¹¹³ÉµÄϵͳÅöײǰµÄ¶¯ÄÜEk1=4J£¬ËùÒÔÒÒÎïÌåºÍ¼×ÎïÌåÅöײ¹ý³ÌÖÐËðʧµÄ»úеÄÜ¡÷E=Ek1-Ek2=2J
£¨2£©Éè¼×ÎïÌ徲ֹʱµ¯»ÉѹËõÁ¿Îªx1£¬
¸ù¾ÝƽºâÌõ¼þ£¬½âµÃx1=
mg |
k |
¼×ºÍÒÒÅöײºó×ö¼òгÔ˶¯£¬ÔÚͨ¹ýƽºâλÖÃʱÁ½ÎïÌåËùÊܺÏÁ¦ÎªÁ㣬ËÙ¶È×î´ó£¬Éè´Ëʱµ¯»ÉѹËõÁ¿Îªx2£¬
½âµÃ£ºx2=
2mg |
k |
¼×ÎïÌåºÍÒÒÎïÌåһͬÉÏÉýµ½×î¸ßµãʱ£¬Á½ÎïÌåÓë¼òгÔ˶¯Æ½ºâλÖõľàÀ룬¼´¼òгÔ˶¯µÄÕñ·ùA=x2+£¨H-x1£©=15cm
¸ù¾Ý¼òгÔ˶¯µÄ¶Ô³ÆÐÔ¿ÉÖª£¬Á½ÎïÌåÏòÏÂÔ˶¯µÄ¾àÀëx=A+£¨x2-x1£©=20 cm
ÉèÁ½ÎïÌåÏòÏÂÔ˶¯ÖÁ×îµÍµãµÄ¹ý³ÌÖУ¬¿Ë·þµ¯»Éµ¯Á¦×ö¹¦ÎªW£¬
¸ù¾Ý¶¯Äܶ¨ÀíÑо¿¼×ºÍÒÒÅöײºóµ½×îµÍµãµÄ¹ý³ÌÓУº
2mgx-W=0-
1 |
2 |
´ð£º£¨1£©ÒÒÎïÌåºÍ¼×ÎïÌåÅöײ¹ý³ÌÖÐËðʧµÄ¶¯ÄÜΪ2J£»
£¨2£©ÒÒÎïÌåºÍ¼×ÎïÌå¿Ë·þµ¯»Éµ¯Á¦Ëù×öµÄ¹¦Îª6.0J£®
µãÆÀ£ºÎïÌåµÄÅöײ˲¼ä£¬ÎÒÃÇÓ¦¸Ã¿¼Âǵ½¶¯Á¿Êغ㶨ÂÉ£®
¶ÔÓÚ¼òгÔ˶¯£¬ÎÒÃÇÒªÔËÓøÃÔ˶¯µÄÌØÊâλÖÃÎïÀíÁ¿µÄÌصãÒÔ¼°¶Ô³ÆÐÔ£®
¶¯Äܶ¨ÀíµÄÓ¦Ó÷¶Î§ºÜ¹ã£¬¿ÉÒÔÇóËٶȡ¢Á¦¡¢¹¦µÈÎïÀíÁ¿£¬ÌرðÊÇ¿ÉÒÔÈ¥Çó±äÁ¦¹¦£®
¶ÔÓÚ¼òгÔ˶¯£¬ÎÒÃÇÒªÔËÓøÃÔ˶¯µÄÌØÊâλÖÃÎïÀíÁ¿µÄÌصãÒÔ¼°¶Ô³ÆÐÔ£®
¶¯Äܶ¨ÀíµÄÓ¦Ó÷¶Î§ºÜ¹ã£¬¿ÉÒÔÇóËٶȡ¢Á¦¡¢¹¦µÈÎïÀíÁ¿£¬ÌرðÊÇ¿ÉÒÔÈ¥Çó±äÁ¦¹¦£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿