Question

17£®Ð¡Ã÷ÔÚ¡°²âС³µµÄƽ¾ùËٶȡ±µÄʵÑéÖУ¬Éè¼ÆÁËÈçͼ5ËùʾµÄʵÑé×°Öã¨S_AC=9.00dm£©£»Ð¡³µ´Ó´ø¿Ì¶È£¨·Ö¶ÈֵΪ1cm£©µÄбÃ涥¶ËÓɾ²Ö¹Ï»¬£¬Í¼ÖеÄԲȦÊÇС³µµ½´ïA¡¢B¡¢CÈý´¦Ê±µç×Ó±íµÄÏÔʾ£¨Êý×Ö·Ö±ð±íʾ¡°Ð¡Ê±£º·Ö£ºÃ롱£©£¬Ôò
£¨1£©¸ÃʵÑéÊǸù¾Ý¹«Ê½v=$\frac{s}{t}$½øÐвâÁ¿µÄ£®
£¨2£©ÊµÑéÖÐΪÁË·½±ã²âÁ¿Ê±¼ä£¬Ó¦Ê¹Ð±ÃæµÄƶȽÏС£¨Ìî¡°´ó¡±»ò¡°Ð¡¡±£©£®ÕâÑù¿ÉÈÃС³µÔ˶¯ËٶȽÏÂý£¬£¨Ìî¡°¿ì¡±»ò¡°Âý¡±£©£¬ÓеÄͬѧÔÚʵÑéÖÐʹÓÃÁ˽ðÊôµ²Æ¬£¬ÆäÄ¿µÄÊÇ×èֹС³µÔ˶¯£®
£¨3£©Äã¾õµÃÔÚʵÑéÖÐС³µÔ˶¯Â·³ÌÊdz¤Ð©ºÃ£¬»¹ÊǶÌЩºÃ£¬´ð£º³¤Ð©ºÃ£®Ô­ÒòÊdz¤Ð©±È¶ÌЩ¸üÈÝÒ×ÕÆÎÕʱ¼ä£®
£¨4£©Çë¸ù¾ÝͼÖÐËù¸øÐÅÏ¢»Ø´ð£ºS_AB=5cm£®t_BC=1s£¬v_AC=3.33cm/s£®
£¨5£©ÓÉʵÑé¿ÉÖª£¬Ð¡³µ×÷¼ÓËÙÖ±ÏßÔ˶¯£¬Ð¡³µËÙ¶ÈÔ½À´Ô½´ó£®
£¨6£©Èô²âÁ¿Ð¡³µÂ·³Ìʱ£¬´íÎóµØ´ÓС³µµÄβ¶Ë¿ªÊ¼²âÁ¿£¬Ôò²âµÃС³µµÄƽ¾ùËٶȽ«Æ«´ó£¨Ìî¡°Æ«´ó¡±£¬¡°Æ«Ð¡¡±»ò¡°ÎÞÓ°Ï족£©£®

Answer 1

·ÖÎö £¨1£©¹«Ê½v=$\frac{s}{t}$¼ÈÄÜÓÃÓÚÔÈËÙÖ±ÏßÔ˶¯ÇóËٶȣ¬ÓÖÄÜÓÃÓÚ±äËÙÖ±ÏßÔ˶¯Çóƽ¾ùËٶȣ»
£¨2£©£¨3£©ÈôÒª¼Æʱ·½±ã£¬Ó¦Ê¹ËùÓõÄʱ¼ä³¤Ð©£»
£¨4£©´ÓͼÖжÁ³öAB¡¢ACµÄ³¤£¬Í¨¹ýBC¡¢ACËùÓõÄʱ¼ä£¬ÀûÓÃËٶȹ«Ê½¼ÆËãС³µÔÚAC¶ÎµÄƽ¾ùËٶȣ»
£¨5£©·Ö±ðÇó³öС³µÔÚÉÏ°ë¶ÎºÍÏ°ë¶ÎµÄËٶȣ¬ÅжÏС³µµÄÔ˶¯×´Ì¬£»
£¨6£©¸ù¾Ýv=$\frac{s}{t}$£¬Í¨¹ý·ÖÎöʱ¼äºÍ·³ÌµÄ±ä»¯·ÖÎöËٶȵı仯£®

½â´ð ½â£º
£¨1£©¸ÃʵÑéÊǸù¾Ý¹«Ê½v=$\frac{s}{t}$½øÐвâÁ¿µÄ£®
£¨2£©ÈôÒª¼Æʱ·½±ã£¬Ó¦Ê¹Ð±ÃæµÄƶÈСһЩ£¬ÕâÑù¿ÉÈÃС³µÔ˶¯ËٶȽÏÂý£¬Í¨¹ýµÄʱ¼ä¸ü³¤£®
ʵÑéÖÐʹÓÃÁ˽ðÊôµ²Æ¬£¬ÆäÄ¿µÄÊÇ×èֹС³µÔ˶¯£»
£¨3£©ÔÚʵÑéÖÐС³µÔ˶¯Â·³Ì³¤Ð©ºÃ£¬ÒòΪ³¤Ð©±È¶ÌЩ¸üÈÝÒ×ÕÆÎÕʱ¼ä£»
£¨4£©ÓÉͼ¿ÉÖª£¬s_AB=5cm£¬s_AC=10cm£¬t_BC=15£º35£º23-15£º35£º22=1s£¬t_AC=15£º35£º23-15£º35£º20=3s£¬
v_AC=$\frac{{s}_{AC}}{{t}_{AC}}$=$\frac{10cm}{3s}$¡Ö3.33cm/s£®
£¨5£©Ð¡³µÔÚÉÏ°ë¶ÎËٶȣºv₁=$\frac{{s}_{AB}}{{t}_{AB}}$=$\frac{5cm}{2s}$=2.5cm/s£¬
С³µÔÚÏ°ë¶ÎËٶȣºv₂=$\frac{{s}_{BC}}{{t}_{BC}}$=$\frac{5cm}{1s}$=5cm/s£¬
ͨ¹ý¼ÆËã¿ÉÖª£¬Ð¡³µ×ö¼ÓËÙÖ±ÏßÔ˶¯£¬ËÙ¶ÈÔ½À´Ô½´ó£®
£¨6£©Èô²âÁ¿Ð¡³µÂ·³Ìʱ£¬´íÎóµØ´ÓС³µµÄβ¶Ë¿ªÊ¼²âÁ¿£¬Ê±¼ä²»±ä£¬Â·³ÌÐèÒª¼ÓÉϳµ³¤£¬Í¨¹ýµÄ·³Ì±ä´ó£¬¸ù¾Ýv=$\frac{s}{t}$¿ÉÖª£¬²âµÃµÄʱ¼äÆ«´ó£®
¹Ê´ð°¸Îª£º
£¨1£©v=$\frac{s}{t}$£»
£¨2£©Ð¡£»Âý£»×èֹС³µÔ˶¯£»
£¨3£©³¤Ð©£»³¤Ð©±È¶ÌЩ¸üÈÝÒ×ÕÆÎÕʱ¼ä£»
£¨4£©5£»1£»3.33£»
£¨5£©¼ÓËÙÖ±Ïߣ»´ó£»
£¨6£©Æ«´ó£®

µãÆÀ ¡°²âС³µµÄƽ¾ùËٶȡ±µÄʵÑ飬һ¶¨Ñ§»á¶Á³ö·³ÌºÍʱ¼ä£¬°´Æ½¾ùËٶȵĶ¨Òå´úÈëv=$\frac{s}{t}$¼ÆËã³öƽ¾ùËٶȣ®