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Title:

Ch4-??????

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Title: Author: Huang Last modified by: Huang Created Date: 2/10/2005 7:52:08 AM Document presentation format: Company – PowerPoint PPT presentation

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Title: Ch4-??????


1
Ch4-??????
4-1 ???????? 4-2 ???????? 4-3 ????????
4-4 ?????????
2
4-1 ????????
  • ???????????
  • ??????????????,??????,??????????? ???
  • ?????????
  • ?????????
  • ???????,?? (a)?
  • ???????,?? (b)?
  • ?????????????,?? (c)?

3
  1. ????????????????????????,???????????????,????????
    ?????????,???????????,????????
  1. ??????????????????,??????????,?????????????,?????
    ?????

????????????????????
4
  • ????????
  • ???????,????????,?????,???????????????
  • ???????????????,????,??????????????????
  • ????????????????,????????????????????????????????
    ???????????????????????
  • ??????,???????,?????????????????????,???????,????
    ????????????,??????????,?????????

5
1-2 ????????
  • ???????????
  • ????????????????,??????????????????,????????,????
    ?????????????,??????????????,??????????????????,??
    ????,??????????

6
  • ????
  • ?????????,?????????,?????? a ?????? F ??????????
  • ?????????,?????,???????,????? a ???? m
    ???,????????????????????

7
  • ????????
  • ????? a ??? F ???,???? m ???,?????????????????
    ?????????,?????????????????
  • ?????
  • ???????????????????
  • ??????????????????????,?????????? a ?
    a0,??????? m0,??????? m ?? ma m0a0,???

8
  • ?????????????????????
  • ?????????????????????
  • ??????????????????????????????????
  • 4. ????
  • ??(nt)??? 1 ??????? 1 ??/?2 ??????,? SI
    ???????
  • ??(dyne)??? 1 ??????? 1 ??/?2 ???????
  • ???(kgw)?? 1 ????????????????? 1??? 9.8 ???

9
  • ????????
  • ??????
  • ????????????
  • ??????????,??????????????
  • ?????????????????????
  • ???????

10
1-3 ????????
  • ?????????????????????,???????,?????????????,?????
    ??????????????,??????????????,??????????????
  • ???????????
  • ????,?????
  • ????,?????
  • ???????????,???????????,???????????????????,??????
    ?????

11
?????????? m1 ? m2 (m1 gt m2),?????????????,??????
????? F ????????? m1,???????????,???? FL?????? F
????????? m2,??????????? FR,??????,FL/FR ?
__________?
81.??
12
???????? 2 ??,???? a ??????? 6 ??,???? a
??????????????????,???????,???? (A) 3? (B) 4?
(C) 5? (D) 0??
??A
13
?????,????????(m1 5kg, m2 3kg,m3 2kg),??
T1 150 ???????,????????(g 10 m/s2)
??T2 75??T3 30??
14
?????????,A?B ?????? F ? 2F ???,???????,?????????
A?B ??????? 23,???????________?
15
???????,???????? m1,??????????
m2??????????????????????,???????????????
16
??(????)?????,??????????????,m2 gt
m1,???????????????
17
????? (a) ??,????????,???????????????,???????????
??????,?????,??? (b)????????,??????????????????
??5 / 9
18
?????,?????????,????????,????????????????
19
?????,m1 5kg,m2 10kg,???? m 2kg,?????,???
F ?????? m2 ????? (g 10 m/s2)
??230??
20
??????,????? 60kg,?????? 40kg,?????????????,?????
?? 2m/s2 ??????,?????????????????????????(g 10
m/s2)
??T 400ntN 320nt
21
?????,???????????? m1 3kg? m2
2kg,??????m1 ?????? 5kg ??????? M ?,????????????
m2 ?????? M ????????,? m1 ????????,? M ????,?????
M ????????
??12 ??
22
?????,A?B ????? m?2m,?????????,?????????? (1) ?
C ????,???????? (2) ? C ???? 3m,?????????
23
??????? m ? A?B?C ??,???????(??????)?? B?C
??,???????? A?B ??,?????????? A ???????? O
??????,??????????? O? A ??????,????????,A?B
?????????????
24
??????,m 3kg?M 5kg,????????????? 0.5,??????
0.4?????????????,???? F ???????(g 10 m/s2)
??72nt
25
???????????? M,????????????,?????? F
?????,??????????????,???????????????????
0.7,??????? 0.6,??????????(g??????)
(A)? F 0.5Mg ?,??????????? 0.5Mg (B)? F 0.5Mg
?,??????????????? 0.7Mg (C)? F 3Mg,?????????
0.8g? (D)? F 3Mg ?,?????????????
0.8Mg? (E)????????,? F ????? 3Mg?
??A
26
?????,???????? 37o ??????????,?????????? 53o
?,?????????????
27
?????? v 10 m/s ??????????,??????????????,?????
???,????????????? µ 0.5,g 10
m/s2,????????????????? m/s?
28
???????,???? m ???????????,??????????????????????
???????????,??????????????
29
??????????????? 37o ???????,?????????????????????
???????? 13,?????????????????
??0.6
30
??????????????? A?B ??,????????? F
?????????????? A?B ????,? A?B ?????????
31
??????????,???????? 45o ???????(???),?? 50 kg
????????????????????????? 60 kgw,????????????,????
????????????,??????????????
??10kgw
32
4-6 ?????????
  • ????????
  • ??????????????????,????(????)???,??????????,??????
    ????

33
a
??????,??? a ??????????,?????????,???????????????
?? a ??????,???????????????? F ma
????????????,??????????????,?????????
34
?????? ???,??????????????????,???????????????????
??????????????????????????????????? ???????????,??
??????????????,????????
35
  • ?????
  • ?????????,???????????
  • ???????????????
  • ?? m ?????????????????,????????????,??????????
  1. ????????? a ?????????????,??????W1 mg ma m
    (g a)
  2. ????????? a ?????????????,??????W2 mg ma m
    (g - a)

a
N
ma
mg
36
???? 60 ???????????????,??????????,???????????? (
1) ????? (2) ? 0.5g ????????? (3) ? 0.5g
?????????
?? (1) 60 ??? (2) 90 ??? (3) 30 ???
?????? 60kg ??????????????,????????????????????
72kg,??????????(g 10m/s2)
37
???????????????,???????????,??????????,?????,????
????????,????????????,?????????????????,??????????
? (A)?????????? (B)??????
(C)??????????? (D)????? (E)????????
??A
38
??????,?????? a ???????,????????????? m
???????????,????????????
39
??????????????????????????????? a
?????????????????????,???? a ???????
72.??
N
ma
mg
a
40
?????,?? m ?????????,??? M ????????????????? (1)
?????? (2) ???????????? (3) ???????????
m
M
?
41
THE END
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