physics數一問

我依家教書教到momentum..
uP9z_2` p 所以希望計既方法盡量唔好係未教到個d=口='
'{aJF:B+x'c&H 我連用邊條fomula去計都唔知- -'
+iX`K Wv`1cj F=ma- -?
}6b3f+T+W3c;|&o6vqs O3n if they are moving together*l-w-[\7?U*i
find f1 amd f2!d/U^ g9F|g

6N@ VSCb [[i] 本帖最後由 kwan608 於 2008-1-26 03:49 PM 編輯 [/i]]

我唔黎回個問題嫁XDXD"..vef
{J{
請準我講一句..
4v f*G uO#G4M[:M 你D字好樣衰XDXD"..5m q$s;pU!h&dh+R6~
[講笑姐XP"]

[quote]原帖由 [i]ＬIＮG[/i] 於 26/1/2008 15:45 發表 [url=http://forum.8cyber.com/redirect.php?goto=findpost&pid=1101094&ptid=14474336][img]http://forum.8cyber.com/images/common/back.gif[/img][/url]%mK%{c!_}Vt
我唔黎回個問題嫁XDXD"..
CL)QUr8s 請準我講一句..(A-MS0t`#gq+C+HO
你D字好靚XDXD"..!^JPU-cp
[講笑姐XP"] [/quote]rIbi w d8^
\口/答案正確
rmBi"@0mPR'q 我d字真係幾靚架
'k ^7o f
Swu&xf1z 唔洗咁讚我架啵

1n 個個係唔係friction???
(w&hF5h^ib .P^'XTyi+S
如果睇1kg個個係10n既話,咁acceleration應該係10.......(by  f=ma);U3| gLr

d9[*r%r0c 3舊野係一齊郁.....所以acceleration應該一樣.......ooL`1Q
.S+|\%z}4D[7Evp

&{9A(qU-]] 再 by f=ma, f1 應該係40n  , f2 應該係50n(Z.~6G4g p*m!G@st
F-b!^ aON9f
BK.wi_F0UG
不過我可能錯,因為冇用到個個1n........ Jds-l*IF(x)d

Q#AH0H yckK+P V 雖然我phy有c......但絕對係呃返黎的......再加上好耐冇掂過=.=