PHY 實驗...求g?

史高深

因為我要設計一個實驗...我就想做一個實驗證明g真係=9.8
我想用唔同既波去度free falling 個time... 但係我又搵唔到個final speed..
有咩方法可以求個g=9.8?

唔該各位!

2076

係地球上g係永遠唔會去到9.8 ga wor

史高深

Originally posted by 2076 at 2005-9-12 04:31 PM:
係地球上g係永遠唔會去到9.8 ga wor

咁係唔係approx 9.8?

2076

Originally posted by 史高深 at 2005-9-12 05:00 PM:


咁係唔係approx 9.8?

因為有air resistance既關係,
個g大約只會有maybe 3-4 m/s^2

Raul

Originally posted by 2076 at 2005-9-12 17:06:


因為有air resistance既關係,
個g大約只會有maybe 3-4 m/s^2

如果佢有vaccum個model呢?

2076

Originally posted by Raul at 2005-9-12 05:07 PM:
如果佢有vaccum個model呢?

v^2=u^2+2as
用data logger

史高深

Originally posted by 2076 at 2005-9-12 05:06 PM:


因為有air resistance既關係,
個g大約只會有maybe 3-4 m/s^2

我用羽毛aiir resistance當然好多...如果我用球體...個air resistance 會唔會細d呢?
請指教!!

2076

Originally posted by 史高深 at 2005-9-12 05:15 PM:


我用羽毛aiir resistance當然好多...如果我用球體...個air resistance 會唔會細d呢?
請指教!!

air resistance is directly proportional to its velocity ga

其實我d phy只係半桶水...
幫唔到你幾多

史高深

Originally posted by 2076 at 2005-9-12 05:18 PM:


air resistance is directly proportional to its velocity ga

其實我d phy只係半桶水...
幫唔到你幾多

anyway....thx !!!

vctwl

Originally posted by 2076 at 2005/9/12 05:06 PM:


因為有air resistance既關係,
個g大約只會有maybe 3-4 m/s^2

唔會咁細架
上次我唔見左條 ticker tape
作九點零都比呀 sir 懷疑
(原來其他人正常咁做都做到九點幾)

一張 bench 既高度點都唔會有咁勁 air resistance

btw, i suggest to use the ticker tape timer
舊就舊 d
不過超方便

史高深

Originally posted by vctwl at 2005-9-12 07:28 PM:


唔會咁細架
上次我唔見左條 ticker tape
作九點零都比呀 sir 懷疑
(原來其他人正常咁做都做到九點幾)

一張 bench 既高度點都唔會有咁勁 air resistance

btw, i suggest to use  ...

就想唔用ticker tape去搵law...
不過我又諗唔到...

2076

Originally posted by 史高深 at 2005-9-12 07:58 PM:


就想唔用ticker tape去搵law...
不過我又諗唔到...

係喎 唔記得ticker tape添...

我諗唔用data logger最好就係用依個la

史高深

Originally posted by 2076 at 2005-9-12 08:01 PM:


係喎 唔記得ticker tape添...

我諗唔用data logger最好就係用依個la

咩係data logger ??