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a. ???? b. ???? c. ????

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Title: PowerPoint Author: wtu Last modified by: dsy Created Date: 6/6/2004 11:13:47 PM Document presentation format: – PowerPoint PPT presentation

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Title: a. ???? b. ???? c. ????


1
?????(?)
2
1??? 2???? 3.???? 4.???? 5??????? a.
???? b. ???? c. ???? d.
??????? e. ????
f. ????????? g. ??????????
h. ??????????????? 6.????????????? ?1
?2 ?3 ?4 ?5
?? 2001??? 2000???22
2001????? ?6
3
(No Transcript)
4
3.???? (1)???? F?t?p ???
(?F???t???,???????p) (2)???? F?S?EK ???
(?F???S???,???????Ek)
???????????,????????????.?????????????.?????????F
?t?p,????????????????????????,??????????????.
?????????F?S?EK,?????????????????????????
5
4.????
(1)?????? ??????????????????? ??m1v1m2v2m1v1
'm2v2 ' ? pp '
(2)??????? ????????(??????)?? ??Ek2Ep2Ek1Ep
1 ? ?Ep -?Ek
6
5???????
???????????????,?????,???????????,?????????.
a. ??????????????
?????,???????????,??????.??????????????????????.
?WG EP1 - EP2 -?EP
b. ??????????????
?????,???????????,??????.??????????????????????
. ?W?? EP1-EP2 -?EP
7
c. ????
??????????????????.?
d. ???????
??????????????????,???????????,???????????.?
EK2 EP2 EK1 EP1, ? ?EK -?EP
e. ????
??????????,???????????????????.? WF E2-E1
?E
8
f. ?????????
(1)?????????,??????,??????
(2)???????????,??????????,????????????????,???????
????????
(3)????????,???????????????????.
9
g. ??????????
(1)??????????,??????,??????
(2)????????,?????????????????????,???? W -f S??
(S?????????????????????????,?S??????????.)
(3)???????????????,???????????????,???? Q fS??
h. ???????????????
(1)???????,?????????,??????,?????????????????,???
??????.
(2)????????????????????????,??????,????.
10
6.??????????????????(Qf?S)
????m2?????????????2??,???m1???????1???????,??1gt?2
,?????????????????f,??????,??????S1,????S2,???????
???? 1 '?? 2 '??????
-f S1m1?1'2/2-m1?12/2      ?
 f S2m2?2'2/2-m2?22/2         ?
??????,?????????,??????????,?????,
?????????????
Q(m1?12/2m2?22/2) -(m1?1'2/2-m2?2'2/2) f
(S1-S2) f?S ?
11
????,????????????,??????(??)??????????????
?????,??Q f ?S ???????,???????????????
(1)??????????????????,?S?????
(2)??????????????????,?S??????
12
?1.??????,??????????,????????,??
A.??????????????,?????
????? B.???????????,???????,
??????? C.??????? D.???????
ABC
??.???m???????L?????,???????????,?????????
A.???????mgL/2 B.??????????g C.???????????
? D.????????
ABC
13
D
14
?3. ??????????????m?????????,???????m????v0
?????????????(????),???????,????????,? (
) A. ?????,?????????? B.
?????,?????????? C. ??????????mv0 2 / 2 D.
??????????????v0 2 / 2g
B C
15
?4. ???R??????abcd,??abl,
adh,???m,?????????,???????,??????????,????????h
,??,??????????????,???????????
. (???????)
2mgh
? ???????, ?????????? ????????????,
?? Q2mgh
16
?5????,??????????????????v????,?????m?????
????????P??,????m????????????µ,??????????,???m
??????????????????,?????????????F,??F ??????????
???m ?????????????,???t ????v
f µ mg a µ g t v/a v / µg
?t ???,??m ???S 11/2v t
?? ???S 2v t
W FS 2 f S 2 µ mgv tmv2
?????????,??F ?????????????????.
W1/2 mv2 f ?S 1/2 mv2 f (S 2 - S 1)
1/2 mv2 1/2µ mgv tmv2
17
??? ???,???m????????v ??????????P?? ,??F
??????????
???m ???????????????,???t ????0??Q?,?
???????????????,???t ????v ,
f µ mg a µ g t v/a v / µg
?2t ???,??m ???S 10
?? ???S 22v t
?WF S 2 f S 2µ mg2v v / µg2mv2
?????????,???????,??F ?????????.
? Wf ?S f (S 2 - S 1) f S 2 µ mg2v t2mv2
18
2001??????????abcd???????????,ab2
bc,????????????a'b ' c ' d '????????, a'b
'??ab???,??????????????,?W1??????ab??????????????,
W2???????????bc??????????????,? (
)
B
  1. W1W2
  2. W22W1
  3. W12W2
  4. W24W1

19
2000???22? ???????,??????????????????????????
??????????????????????A?B???????,?????????????????
?????????????????P,??????C??????v0 ??
B?,?????C?B?????????????D??????????????,??????????
,???????,???????,A????P????,??A?D?????,A?P????????
????,??????(?????????????)???A?B?C???????m?
(1)??????????A????? (2)??A?????P????????,???????
???
20
(1)?C??B????D?,D????v1,?????,?
mv0 (mm)v 1 ?
????????,D?A?????,?????v2 ,?????,?
2mv1 3m v2 ?
???????A??? v21/3 v0
?
21
(2)?????????,?????????? EP ,?????,?
??P?,A?D ??????,?????,????????????,???????D
???,?D????v3 ,??
?????,A?????P,???????A?D??????,??????????????v
4 ,?????,?
2mv33mv4 ?
??????
22
2001????? ????,A?B????????????????????A????B
??????????????M2.0kg,????l 1.0m,C
?????m1.0kg???.???????v0 2.0m/s,???B?????????.??
??????,?C?A?B??????????µ0.10.???A?B?C????????????
.??????g10m/s2.
23
???????C ???B????? x ?,??B?.??A?B?C ???????,??V.
??????
?????,??B ????S,???C ????Sx.
??????
???????
?????
24
x ?B ????l ?.??????C????B??,????A ??.?C
???A ??????v1,??A?B?????V1,???
???????
??????
?????????
??v1 ????,??????
25
???A??,B ??V1 0.155m/s ?????.?C ??
v11.38m/s ????A?????.??A????y ??????A?,??C ?A
????V2,???
??????
?? V2 0.563 m/s
?
??????
?? y 0.50 m
y ?A ?????,????C ?????A ??.??A?B?C ??????
26
?6. ???,????????,???m???B???????,??????,???2m
???A????v0????,??????????B??,??????A?????. (1)????
??????,???????EP??? (2)?????B?????????????,?A????
?????B????????,???????????,?B???????????,??B??????
???????,?????????????,???????(1)??EP?2.5?,???B????
???????????
27
? (1)??????????,AB?????????v,
???????
2mv03mv
????????
EP1/22mv02 -1/23mv2 mv2/3
(2)????????????
???? 2mv02mv1 mv2
???? 2mv1- mv2 3mV
????????(???????)
1/22mv02 1/23mV2 2.5EP
??v10.75v0 v20.5v0 Vv0/3
28
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