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예제 3.2

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50 kg

25 kg

A

B

50 kg

25 kg

A

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A

B

50 kg A

T

25 kgB

T

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25 kg

A

50 kg A

T=25 x 9.81 N

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50 kg

25 kg

A

B

50 kg

25 kg

A

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30o

A

B s=0.12

k=0.10

s=0.24

k=0.20

mA=10 kg m

B=5 kg

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B

WB

F

N1

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B

WB

F

N1

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A

N1

F

F

N2W

A

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A

N1

F

F

N2W

A

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예제 3.3

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예제 3.4

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= 15o

10 m

A

C

=0.12F

N

F=k F

N

W

예제)

a)

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= 15o

10 m

A

C

=0.12

FN

F=k

FN

W

b)