?r;ry
/YazzL
nuassnrefers
,llre
'a. tcrn
vclght
d. acceleratlon
the sane physlcal
b. lnertla
c. volune
concept a s i
c. force
::,i.'.'l:r"T3$!|t9Biiis:ri-;
In an automobile collision, a 44-kilogram
passengermorring et 15 meters per second is
L*rref,t to tot bv-anair bagduring-a0,I0-sccond
timcintenal. Wf,et is the iaepitude of the averduring this
agc forcc excrted on the Pas-senger
ti-mc?
(3) 44ooN
(l) 440N
(4) 6600N
(2) 6bo N
A womanexensa'constanthorizontalforceon a largebox. As a result.thc box moves
acrossa horizonulfloor at a consFntspesd"vo".
The constanthorizontalforceappliedby thc woman:
(At hasthesamemagnirudcasthe weight of thebox.
(B) is greatertbanthc weightof the box.
(C) hasthe sanc magnitudeasthc total forcewhich resiststhemotionof the box.
(D) is grcarerthadthetoal forcc which resiss the motionof thebox.
(E) is grearcrthaneitherthe weight of the box or the tol:l forcewhichresistsits motion.
If thewomu in theprcviousquestiondoublcstbe constanthorizontalforcethat sheexens
on thc box to pushit on the samchorizontd floor, the box thenmoves:
"vo" in theprcviousquestion.
141 with a constantspeedthat is doublethe spced
(B) with a constantspeedthat is greaterthanthc speed"vo" in thc prcviousguestion,but
'
not necessarily
wice asgreat.
(C) for a while with a speedthat is constantandgreaterthanthespeed"ve" in the
previousquestion,thenwith a spccdthatincreascsthereafter.
(D) for a while with an increasingspeed,thenwith a constantspeedthereafter.
(E) with a continuously
incrcasingspced.
b
If thewomanin qucstion suddenlystopsapplyinga horizontalforceto the block, then
, theblockwill:
(A) immediarcly
cometo a stop.
(B) continuemovingat a constantspcedfor a while andthenslowro a srop.
(C) immediatelystartslowingto a stop.
(D) continueat a constantspced.
(E) inctcaseits speedfor a while and thenstanslowingto a stop.
lz"5_l
@
A force of 8.0 N is exerted for 4.0 s on.p 16 kg
obJect tnl tlally
at rest. The change in speed-of thts obJgt ,fif
t
Ul,
r. 0.5 n/s
b.-2 n/s
c. 4 nls
a.-g ,7"'
e. 32 n/s
(N"' 'F-at,.)
0nn
AW7,
///77W
(N"
The unlt of force called
the nevton Is:
a. 9.8 lcg
b. I kg.n/sZ
c. detlned by neans of Nevtonrs
thlrd lav
d. I kg of hass
e. I kS of force
0nn-
*4W-fr
The table below lists the coeflicientsof hnetic
friction for four materials,liding ouli;;1"-Material
Coeffici6nt of
Kinetic Friction
aluminum
brass
coPPer
steel
0,47
0.44
0,36
0,57
10::49g"m block of eachof thesematerials
I
is pulled horizontallyacrossa steelfloor at constantvelocity,Which block requires the smallest
appued^torce to keep it moving at constant
velocitv?
(1) aluminum
(3) copper'
(2) brass
(4) steel
P.,;lt.)
*&n-fo"o
/ / / / /
/ / / / / //
The diagram below represents a block sliding
down an incline.
Which vectorbest representsthe frictionalforce
actingon the block?
(3) c
(1) A
(2) B
(4) D
In the diagmm below a box is on a frictionless
horizontdiurface with forcesF, andFoacting as
shown.
Frictionlesssurface
If the magnitudeof F, is greater than the magnitude of F' then the box is
(t) moving at constant speed in the direction
ofF
(2) moving at constant speed in the direction
of F,
(3) acceleratingin the direction of F,
(4) acceleratingin the directionof F,
A differentforce is appliedto eachoffour l-kilogramblocla to slide them acrossa uniform steel
Jurface at constant speed as shown below. In
of friction
which diaffi-'Fffiefficient
betweenth-eblock and steelttnallest?
0
In the diagrarn beloq
inclined plane.
a box is at rest on an
Horizontal
of
Which vector best represents the direction
box?
the
on
actin!
force
thu ,,ottotl
(3)c
(I) A
(4) D
(2) B
_-t t\ The diaerambelor shoun a l0'Gkilogram mass
/ | 4 | h"td ott&t oo a friaionless30.0"inclineby forceF'
I
\'-
.J
10.0kq
F
,
What is the approximatemagnitudeof force F?
(3) 85.0N
( 4 )e 8 , 1 N
(1) e,8IN
(2) 49,rN
A SO.-newtonhorizontal force is needed to keep
an object weighing 500. newtons moving at a
qonstant velocity of 2.0 meters per second across
a horizontal surtace. I'he magnitude of the fric6onal force acting on the object is
ht
(1)5oo.N
(2) 450. N
(3) 50.N
( 4 )0 N
ll | | A seriesof unbalancedJorces
wasappliedto eachof two blocla,A and B. The
- --- graphs
showthe relao--r--- below
between
unbalanced
lcttionship
forcel-nd accereration
for eachbiock.
lls ^t'
UnbalancedForcevs.
UnbalancedForcevs.
Acceleratlonfor BlockA
Accelerationfor BlockB
(m/sz)
Acceleration
Acceleration
(m/s2)
Comparedto the massof blockA, the massof block B is
(1) the same
(3) half assreat
(2) trvice asgreat
(4) four tiries asgreat
(?
Which graph best represents the relationship
between accelerationdue to gavity and massfor
objects near the surface of Earth? [Neglect air
resistance.l
o
E
-9
o
()
ll , ,/ z lt t/
l/
l/
'!
(E
-g
o
t)
o
Mass
(3)
Mass
(1)
.o
i:
()
(l,
C)
il
t\
l\-
Mass
(2)
.9
E
-9
Q)
o
tI _
I
Mass
(4)
.An astronautweighs500 newtonson Earth and
25 newtonson asteroidX. The acceleration
due
to gravityon asteroidX is approximately
(1) I m/sg
(3) 0,2 m/sz
(2) 2 rn/sz
(4) O.trnYsz
frictlonless
Tvo blocks (X and Y) are ln contact on a horlzontal
the
shovn'
X
as
to
applled
ls
force
N
"oi"t.r,t
surface. A 35
force exerted bY X on T ls:
e . ' 3 6N
d . 3 0 N
c. 29 N
b. 6.0 N
a. 1.5 N
rq - 4.0 ke
nr-20kS
@'
A3/4/ horlzontal force ts applled to a LQil' block on a rough
horlzontal surface. The block ls lnltlally
at rest. lllth
rs = 0.5 and uk = 0.4, the total frlctlonal force on the
block ls:
a , 2 N
,.3il,,
c,4/
d. 5l/
e. I}/V
'?
- :N
F
ltopl
--7-ry-/"/L-l
2777
(f!:rr,
1-199 kg.elevator. accelerates dorrnvardsat 3.0 m/s2. The force
by the cable-"i-ii"-"rli"to,
:*":t:d.
r",
l. Z.l N, uD
d.4.cki;;;*
l: i:i H;i;*
'@
ftrN = | k,loNc"tton
t
c. 4.8 ld.I, up
(
Jt7'
A blockof mass2 kilogramsslidesalongahorizontaltabletop.
A horizontal appliedforce of 12 newtonsand a vertical applied forceof 15newtonsact on the block,as shown above.If
the coefficientof kinetic friction betweenthe block and the
table is 0.2,the frictionel forceexertedon the block ig most
nearly
(,t) 1 N
(B)gN
(c)4N
( D ) 6N
(E)?N
//
6)
A boy pulls a wooden box along a- rough horlzontal fLoor
at constant
speed by neans o f a f o r c e P a s shom. Ihtch of the
tottovtffiGi
be true:
a . P o f a n d N- V
d . P > f b n d N ' Y
b . P = f a n d N> r
e. noneof these
c . P ) f a n d N< Y
If: welght
f: frLctlon
N: nornal
Pr f5rcr of Eay
A block of nass m ls pulled along a rough horlzontal
applled force T as shovn. The vertical componento.f the force
fo'"al
eilrted on the block by the floor ls: (Vo.-rl
c. ng + Tcos@
b. ng - Tcos@
e. TslnQ
3:fr:- rslne
A rocketdrifu sidcwaysin outerspaccfrompoint.'"a"to point "b" asshownbelow.The
rocketis subjectto no outsideforces.Smningat pbsition.i'b':.
therockets erieineis turncdon
andproduces
a constantthnrst(forceon therockct)at right anglesto thelinel'ab", The
constant
thnrsris mainainedunril therockerrcachesa poinr"c-"in space.
ED
21. Whichof rhepathsbelowbestrepresensthepathof therockerberween
points"b" and
" c "?
, t O C? c
,
z.ri
\ H /
I
oc
(b)
(E)
I
I
(
(
- - - > ab
'!lo c
I
a
t
a
- -->a D - - - > J b
--+f b------"
---> o b-
froblc,?,t -
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