Equilibrium Clipvidva
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Transcript of Equilibrium Clipvidva
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1
1.
2.
3.
4.
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2
1.
1.
3
1.1 ( )
2
-
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1.2
1.3
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3
2.
()
2.1 2
2 2
1. 0F
2.
2.2 3
2
:
0F 0M
:
0M
:
0F
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4
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1. 0F
2.
3.
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1. 0F
2.
3.
2.3 3
3
1.
2.
3. 0F
3.
2
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......
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3.1
X Y X Y
0xF 0yF
3.2 2
60
4
60
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8
21 5
2 20
45 45
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7
164
1R , 2R 3R
3R
1R
2R
3.2
1.
2.
0F
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8
m
30
50 g = 10 2/m s
10kg
m
=0.2
37 50kg
100kg
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9
1w 1T , 2T , 3T
4T 2w = 280
500
2w
1w
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10
2.
1.
2
1.1
O P
1.2
Pcos
Psin
P
L
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11
AB L P
:
2.
3
1. 0M
2. 0xF
3. 0yF
P
B A
P
L
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1.
2. Take Moment
3. 0xF 0yF
AC 30 A AC
C 60
400
BR
1. 200 2. 300 3. 400 4. 500
C
B
A 60
400N
BR
B A
2m 2m 2m 2m
400N
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200
6 120 1
8
1F 2F 2F
3 1F 0.8 /
30 60
B
A
L
L
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12 1
2 3
80 A B
D
C B A
60
80N
12
3
2m 1m
80 40 80
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3.
1.
(C.M.)
(C.G.)
C.G. C.M.
.. C.G. C.M. .
C.M. C.G.
C.G. C.M.
C.G. C.M. 2
1. C.G.
2.
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C.G.
C.G. C.G. ()
T mg A B C
() ()
(C.G.)
C.G. C.M.
1m , 2m 3m
1x , 2x 3x C.G.
C B
A
A
mg
T
mg
T
mg
T
A
B
() () ()
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17
C.G. C.M.
C.G. X Y C.G.
1m , 2m 3m
X
Y
NOTE
..
C.G.
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18
:
.............
.
................................
.......................
................................
.......................
................................
.......................
................................
.......................
1 2 3 4
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19
2.
3
1. (Stable Equilibrium)
2. (Unstable Equilibrium)
3. (Neutral Equilibrium)
1.
2.
3.
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20
AB 3 20 A B
30 40 A 1 2
20 40
ABCD 30 2
1, 2, 3, 4
3 8
3kg 4kg
2kg 1kg
(0,30)
C(30,0)
B(30,30)
D(0,0)
A
X
Y
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21
10 5
1 0.45
.
tan
.
tan ()
.
4
8 1
B A
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22
4.
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2
50
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24
, ,
1 ( 2) , , 1 , 2548
,
