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terryxx14 2012-7-11 06:10 PM

求師兄請教..........

呢題係FORCE & MOTION
[attach]1870912[/attach]
總有一題係電
[attach]1870913[/attach]
請各位大大打救!!!

14c14c 2012-7-11 09:24 PM

1.
3g-T1=3a
T1-T2=5a
T2=2a

T1=7a
3g-T1=3T1/7
T1=2.1g (N)
T2=0.6g (N)

terryxx14 2012-7-13 02:00 PM

Chung有冇得詳細?呀!我物理白痴黎嫁!:smile_39:



[url=http://www.discuss.com.hk/android][img=100,23]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img][/url]

14c14c 2012-7-13 03:17 PM

[quote]原帖由 [i]terryxx14[/i] 於 2012-7-13 02:00 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=335518993&ptid=19927769][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Chung有冇得詳細?呀!我物理白痴黎嫁!:smile_39:



[img]http://i.discuss.com.hk/d/images/r10/androidD.jpg[/img] [/quote]
3g-T1=3a - (1)
T1-T2=5a - (2)
T2=2a - (3)
呢三條式你明唔明先...
(1)係考慮最右手邊果舊野既motion
(2)係考慮中間果舊野既motion
(3)係考慮左手邊果舊野既motion
take right to be positive
因為佢地係用繩連住, 所以成個acceleration(姐係a)都係一樣

Zzlaz 2012-7-13 03:26 PM

最後果條, as I remember.

I3 =I1+ I2

6 - I3(50) = 0
I3 = 0.12A

12 - 200I2 - 50I3 -100I2 = 0
6= 300I2 -> I2 = 0.02A
I1 = 0.1A

terryxx14 2012-7-13 04:14 PM

我計到T1係30N
          T2係8.57N
(1)個度點解5係T1=7a既??
同埋點解係3g-T1=3a??
[quote]原帖由 [i]14c14c[/i] 於 2012-7-13 03:17 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=335525638&ptid=19927769][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]

3g-T1=3a - (1)
T1-T2=5a - (2)
T2=2a - (3)
呢三條式你明唔明先...
(1)係考慮最右手邊果舊野既motion
(2)係考慮中間果舊野既motion
(3)係考慮左手邊果舊野既motion
take right to be positive
因為佢地係 ... [/quote]

[[i] 本帖最後由 terryxx14 於 2012-7-13 04:24 PM 編輯 [/i]]

Zzlaz 2012-7-13 04:30 PM

[quote]原帖由 [i]terryxx14[/i] 於 2012-7-13 04:14 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=335530833&ptid=19927769][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
我計到T1係30N
          T2係8.57N
(1)個度點解5係T1=7a既??
同埋點解係3g-T1=3a??
[/quote]
the net force on the system is not zero, i.e. accelerating.

as no friction is provided, it is predictable that the blocks will slide and fall.

terryxx14 2012-7-13 06:33 PM

thx ching:loveliness:
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