Sept./18/2008

Dr. W01

1. 1991 (Sep.)-1995 (May.)

2. 1989 (Sep.)-1991 (May.)

30 %: 20% 3%

: 1x 30 %=30 %

: 2 x 5 %=10%

---

2%, (14)

: 1x 10 %=10 % ()

: 1x 10 %=10 % ()

: 25 min presentation, 5min Q&A

Power-point presentation

Word13, 12

:

---- topics

---

---

1.

2. 3.

4.

5.

6.

8. 7.

---

& &

2. Textbook

(1) Harris Benson, University Physics, Revised Edition, Wiley

International Edition,

(2) Reese, University Physics, 2,

, ,

, 0005A7

C = ( K + S ) A C=CompetenceK=KnowledgeS=SkillA=Attitude

Stein B.Jensen, et al. ICEE 2001 International Conference on Engineering Education 2001 Oslo, Norway

1.1 1.1

1.2 - 1.2 -

1.3 1.3

1.4 1.4

1.5 1.5

1.6 1.6

1.7 1.7

1.8 1.8

m (momentum)

SI

m (momentum)

SI

rv rp

r rp vm

kg m / s

CH1CH11

r rF atotal = m

r r

F ptotal =ddt

r r

F ptotal total=d

dt

r r r

rr

F p v

v a

totaltotal= =

= =

ddt

ddt

m

m ddt

m

( )

CH1CH11 1.1

rv i= +( . )$5 00 m / s ( )$600 m / s j

600 kg

a. b. 0.145 kg

CH1CH11r rp v

i j

i j

=

= +

= +

m

(600 kg)[(5.00 m / s) m / s

kg m / s) (3.60 10 kg m / s3$ ( . )$]

( . $ )$6 00

3 00 103

p = + =

[( . ) ].

/300 104 69 10

3 2 1 2

3

kg m / s) (3.60 10 kg m / skg m / s

2 3

p m=

4 69 103. ) =kg m / s (0.145 kg

= =3 23 10. 4 m / s 32.3 km / s

b. b.

CH1CH11 -

CH1CH11

r rF ptotal ( )t dt d=

( )t ti fr r

r

r

F pp

p

totali

f

i

f ( )t dt dt

t=

r r rF p ptotal f ii

f ( )t dtt

t=

r rI F total

i

f ( )t dtt

t

CH1CH11 (1.3)

- (impulse-momentum theorem)

r rp pf i rp

r rI p=

CH1CH111.2 ti tf

( )t ti f

CH1CH11 (impulsive force)1.3

F t F dt Ix x xtt

ave totali

f

I F t px x x= =ave

F ptxx

ave =

CH1CH110.250 kg2.00 m

a. (1.4)

b.

c. 0.010 s

7.2

CH1CH11y y t a ty y= + +0 0

212

y

ay

y

0

0

2 000

==

=

. mm / s

9.81 m / s2y = 0

0 2 00m m (0 m / s) 12

( 9.81 m / s )2 2= + + . t t

t = 0 639. srI j j

j

= =

=

( $) $( )$

mg dt mg dt

mg t

t t

0 0

0rI j

j

=

=

( )$

( . $0.250 kg)(9.81 m / s )(0.639 s

1 kg m / s )

2

257

CH1CH11m/s27.6)s)(0.639m/s9.81(m/s0 20 =+=+= ta yyy

j)m/skg57.1(j)m/s6.27kg)((0.250vp ff ===rr m

rp ji kg m / s= ( )$0

j)m/skg57.1(j)m/skg0(j)m/skg57.1(ppp if

===

rrr

( .t = 0 010 s)

j)m/skg57.1(j)m/s6.27kg)(025.0(vp impacti

===

rr m

rp jf 0 kg m / s= ( )$2

j)m/skg57.(1j)m/skg57.1(jm/s)kg0(ppp if

===

rrr

r rI p=

j)N106.1(s010.0

j)m/skg75.1(IF2

2

ave

=

=

=

t

rr 16 10

2 4565

2..

=N

N

b.

b.

CH1CH11

(conservation of momentum)

rp total

0 N total= ddt

rp

rp total

r r

F ptotal total=d

dt

CH1CH11

r r rp p ptotal bfr bfr bfr +1 2r r rp p ptotal aft aft aft +1 2r rp ptotal bfr total aft=