?????,???????????????,??????????

1
???
?????????????????,???????,???????,????????????????
???
??????????,??????????????
2
?????,???????????????,??????????????(K-W)?
3
???????,????????????????????????????????,?????
???????
???K?W,???????????????????????????(K-W)??????,????
???????????????????
(?)????????????? (?)?K?W?????????,?(K-W)??????????
??????? (?)K?W?????????,????????????????????????K?
W??????,????????????? ??????????????????(energy
)???????K???(kinetic energy),W??(work),???????
??????
4
????
?????????
????(scalar)
dWF?dr
??Nmjoule(J)?? kg(m/s2)mkg(m/s)2

5
A?BABcos? ??????
???
???
??????????????,??????? A Ax i Ay j Az k
B Bx i By j Bz k
A?B Ax Bx Ay By Az Bz
6
???????????????(????),??????????
7
???????????????(power)?????????
?????(instantaneous power)??
8
????????800kg,?????????18(???????????????18?????
)???????,??????????1.3 ?108 Joule,??????????27
m/s (60 mi/h)????????
A. 0.1 B. 0.07 C. 0.03 D. 0.01 E.
0.007 gal
9
???????60 mi/h???????????35 mi/gal??????????????
A. 50 B. 60 C. 70 D. 80 E. 90 (kW)
???????????,?????????????,??????? ?????? (60
mi/h)/(35mi/gal)12/7 gal/h
10
???????(?????????)
??????
http//www.toyota.com.tw/
11
???? ????
??/??/?? (mm) 4610/1755/1665
??(mm) 2750
???(mm) 1530
???(mm) 1520
????????(m) 5.3
????????(m) 5.6
???? 205/55/R16
????(L) 60
??? ??(Kg) 150050
??????? ???????
???? MZR DOHC 16V
???(c.c.) 1999
???? ?????????????
???? (DIN) 148 ps/ 6000rpm
???? (DIN) 19.2 kg-m/ 4500rpm
?? x ?? (mm) 87.5 x 83.1
??? 10.8 0.3
???? Activematic ???????
12
Rolling friction of tire is about
How fast can this car run, if only rolling
friction is considered?
A. 150 B. 220 C. 320 D. 800 E. 1800
(km/hr)
13
Rolling friction for a hard wheel on a hard
surface is quite small and is a combination of
contributions of static friction and friction
from molecular adhesion. For example, the
coefficient of rolling friction for a train wheel
on a steel rail is only 0.001. That is less than
the coefficient of sliding friction on ice. But
an automobile tire is made of rubber and is
filled with air. It deforms under the weight of
the car, and that deformation contributes greatly
to the rolling friction. The result is that the
coefficient of rolling friction is about 15 times
as great. A typical automobile tire has an
average coefficient of rolling friction of µR
0.015
14
Air Dray (Air Friction)
http//www.atmosphere.mpg.de/enid/Information_ss/V
elocity___air_drag_507.html
15
??(?)???????????? (?)??????????????????????? (?)?
????????????????????????(km/hr)???? (?)??????,???
??????????? (?)?????????????
16
?-????(Work-Kinetic Energy Theorem)
Spring-Mass System (??????) ??????????????,???????
?????????????????? F-kx
???? xi-D, vi0 ??1 xf10, vf1? ??2 xf2?, vf
20
17
??????????????,???????????,????????????????(??????
),????????????,??????????????? (conservative
force)?
I
r2
r1
II
18
????????????????????,????????????r?????U(r)(??????
?),?????(potential)? ???????
? dU-F?dr
19
????Spring-Mass System
??US(0)0,?????
???????????????(Mechanical Energy)?????????,??????
??,??,???????????,??????
20
??????????
???????1 kg???,????????50 N/m???????????,????????
1 ???(??????)???????????K???U?????(KU)??????????
??
21
?????????? ????0.8kg???,?????????0.5????,????????
50 N/m????????????????????1.2 m/s,??????????????
A. 0.1 B. 0.3 C. 0.5 D. 0.75 E. 1
(m)
22
????????????????????????????
??????Lennard-Jones????,????x??????????????????
????????????
A. 1.0 B. 0.87 C. 0.52 D. 0.29 E.
0.14 (nm)
???????????????,?????????????
???U-x??F-x?,??????????xeq
?????????
23
????(Gravitational Potential Energy)
?Ug(0)0,???? ????Ug (y)mgy
24
??????(bungee jump) ????????????,????15??????????
?8??,?????200 N/m?????????????????????????????????
??80???????,(?)????????x N/m?????(??????)?????(?)?
????????,??????????(?)?????,????????????????G?