girlsliencekid 2010-7-30 12:34 PM
AL Phy 1996 Fluid（已解決）
part b) Why is the spinning direction of the ball clockwise?
[[i] 本帖最後由 girlsliencekid 於 2010-8-1 02:01 PM 編輯 [/i]]
36661124 2010-7-30 08:02 PM
畫空氣流動 既圖
令到 上面氣壓大 下面氣壓細
[draw]a11i27028c27028ba11i24126d24126924525b24525824725124824c24f24626523d27c23429322e2bc2222d121c2f321b312321b314d21c318322f319823931ac24731b024a31b224e31b224fa11i31b323431b223c31b225431ac25731a0254a11i2e72342e72352e624d2e6245a11i2e622b2ed22b2f32362e22402e123da11i311622f310f22d2f7239310824131162353116234311e242a11i3124234312e231313b22fa11i31352253134231313b247a11i314822931482313148248315223d31532403154245a11i31cb21331cb21231df21231e1212a11i31cc21231cc21431cc24c31cd27c31cd29c31cd2a031e929f31ec29f31f129f31f229fa11i2c029e2c82872df27b2f127c310028d310029e2f92a72ed2a82db2a72d12a22cc29d2ca298a11i315e280315428531422863129281311727a310826f2fb2672f02612dd25f2cd25f2ba2692ac2752a328129428827828b27028ba11i315e26f315a26f3148271313926f312a26b3115265310525d2fb2562f12522dc2522cd2532bb2582ac25e29b26e28e27427127e26c27ea11i31532a8314b2a831372a8312a2a7311e2a631112a631062a82f92aa2f02ab2e42ab2d72ab2cc2aa2c52a62bc2a42a92a52882ac2872aca11i31442b1313f2b231212b231142b2310a2b32ee2b82d92bd2cb2bc2c42b72ba2b22aa2b12932baa11i3145268313e269313b26931422723142274a11i313d27e313727e312b2813134285a11i313029b312e29d311f2a431252a831292aca11i312a2b031282b031192b531222b8a11i2d82882da2882e92882f128c2ee2992e62a12db2a32d82a2a11i2db2962d62982cd29e2e22a32eb2a6[/draw]
1.決定左個path先
2.決定上 面/下面 邊個既F(due to pressure) 大d 係e個情況,個向下既力大過向上既,所以先有咁既path
3上面個F細, P細,V快 下面個F大,P大 ,V慢
4.畫返空氣流動既方向(而家空氣向左流,如果想要上面個V快就要CLOCKWISE咁轉)
5.跟住1-3 既情況去搵返BALL既SPINING 方向
[[i] 本帖最後由 36661124 於 2010-7-30 08:19 PM 編輯 [/i]]
girlsliencekid 2010-7-31 01:23 PM
[draw]a11i28729c2af2742f923d314f227315f225a11i31442203165220316d220316e22031612273152234314f237a11i29725729625728724a28023b28223129422d29923129623828a23fa11i29e2232a12202bb21e2bf2232c02292ae2272a52292a72332b92342c422e2c622b2c422ba11i2c92262ca2252db21f2e021da11i2d42172d92232e32322ea22ba11i2e62182ef2212fb2312f622a2f32202f321a2fe218310e218311221e3116224a11i26029826329826929827629c27f2a22852a92852ae2832b727f2be2772c426b2c62662c62612c525e2c225a2be2572bb2552b62552b02552aa2562a325629f25929b262297264297[/draw]
但係ｂａｌｌ 的ｐａｔｈ，由圖所顯示，唔係向上，係向下的嗎？？
36661124 2010-7-31 01:35 PM
[quote]原帖由 [i]girlsliencekid[/i] 於 2010-7-31 01:23 PM 發表 [url=http://lsforum.net/board/redirect.php?goto=findpost&pid=2272666&ptid=146084][img]http://lsforum.net/board/images/common/back.gif[/img][/url]
[ Free Drawing@DZ ]
但係ｂａｌｌ 的ｐａｔｈ，由圖所顯示，唔係向上，係向下的嗎？？ [/quote]
個path 由左手邊去右手邊既 slope 越黎越平
姐係有個 向下既力大過向上既力
girlsliencekid 2010-8-1 01:59 PM
明白了∼謝謝∼