Download CP CircularGravityReview

Period
Date
Ghapter Tert
Gircular Motion
TRUE OR FALSEOUESTIONS
Circle the correct answer.
1. The outside rim of a rotating turntable has a greaterlinear speedthan parts
closerto the axis.
T
2. Any force that causesan object to move in a circular path is called a centripetal force.
T
3. It is possibleto rotate a very large cylindrical spacehabitat around its central
axis at just the right speedso people inside the cylinder will experiencea
force that feels like gravity.
4. A bug on a turntable will make more turns per minute if it is located nearer
to the center of the record.
5. when you whirl a can on the end of a string, the centripetal force on the can
is actually the pull of the string on the can.
MULTIPLECHOICEOUESTIONS
Choose the best answer to each question and write the appropriate letter in
the space provided.
6. \Mhich has greaterlinear speed,a horse near the outside rail of a merry-goround or a horse near the inside rail?
A)The outsidehorse
B) The inside horse
C) Neither-they both have the same linear speed.
7. \ttthichhas greaterangular speed,a horse near the outside rail of a merry-goround or a horse near the inside rail?
I
A) The outside horse
B) The inside horse
C) Neither.They both have the same angular speed.
B . Which of the following is NOT a unit of rotational speed?
A) Revolutionsper second
B) Rotationsper second
C) Revolutionsper minute
D) Metersper second
9 . lVhat is the direction of the force that acts on clothesin the spin cycle
of a washing machine?
A) Outward
B) Inward
C) UP
D) Doum
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Chapter9 Test
l7
r- iSCt' ,-/\"R- MC itC"l
t0.AtincanwhirledontheendofaStringmovesinacirclebecause
A) once the can startsmoving, that is its natural tendency'
B) the can continually pulls on the string'
Cl there is a force on the can pulling it outrivard'
D) the string continually pulls inward on the can'
suddenly
I l. If you whirl a tin can on the end of a string and the string
breaks,the can will
A) fly directlY awaYfrom You'
B) fly directlY toward You.
C) fly off, tangent to its circular path'
D) spiral awaYfrom Your hand'
12.Aladybugrestsonthebottomofatincanthatisbeingwhirledinah
holds this
zont;lcirile at the end of a string. \Alhat exerts the force that
ladybug in a circle?
A) Your hand
B) The string
C) The can
D) GravitY
jnside a rotating spacestructure thal
13. people in the future may well live
on the inside I
more than 2 km in diameter.Inside the structure,people
theouteredgewillexperiencelgwhilepeoplehalfwaytotheaxiswi]
experience
A)29.
B)19.
C)rt2g.
D) 1/4g.
MATH PROBLEMS
Solvethefollowingproblemsinthespaceprovided.Showallwork,
14.Averticalpolestandingagainstawalltopplestotheground.Thece
does the far e
the pole has a speedof"f dm/s as it hits. With what speed
of the Pole hit the ground?
m from its center' the
15. At the outer edge of a rotating spacehabitat' 200
at a dis
rotational accelerationis g. Whit is the rotational acceleration
tance of 100m from the center of the habitat?
ESSAYOUESTION
question'
On a separate sheet of paper, answer the following
speed' \t4rert
16. Discussthe dift'erencebetween linear speedand rotational
doesatadybugsittingonarotatingrecordhavethegleatestlinearsp
kind of speedwould she have at the cent
gr"ur"., rotati6nat sp"eed?\.Mhat
r8
Chapter9 Test
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Period
Date
Ghapter lest
Universal Gravitation
TRUE OR FALSEOUESTIONS
Circle the correct answer.
T
F
T
F
T
F
3. Becausethe earth and moon are gravitationallyattractedtowards each
other, they will soon collide.
T
F
4. The gravitationalforce ofthe earth on an object decreasesas the object
moves farther from the earth.
T
F
5. If the earth were its presentvolume but more massive,we would weigh
more.
f . Somescientiststhink that the universewe live in is oscillating.
2. Becausethe earth is "falling" around the sun, it will eventuallycrash into it.
MULTIPLECHOICEOUESTIONS
Choose the best answer to each question and write the appropriate letter in
the space provided.
6. \Mhy did Newton think there was a force acting on the moon?
A) Becausethe moon alwayskeepsone side toward the earth
B) Becausethe moon movesin a curved path
C) Becausethere is no air on the moon
D) Becausethe moon is moving
7. Newton had the insight to seethat the
A) moon alwayskeepsone side toward the earth.
B) moon orbits the earth.
C) moon is moving.
D) force on the moon has the same nature as the force on an apple.
B. Newton hypothesizedthat the moon
A) is a projectile.
B) is actually attracted to the earth.
C) has tangential velocity that preventsit from falling into the earth.
D) all of the above
9. Newton reasonedthat the gravitationalattraction between the earth and the
moon must be
A) directly proportional to the squareof the distancebetween them.
B) inverselyproportional to the squareof the distancebetween them.
C) the same at all distances.
D) independent of distance.
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Chapter 12Test
23
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10. Gravitational
this
forces are the
found
weakest forces
of
in nature' Because
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;ih;T t" tn1l?o"cts easrlyobservedinvolve
€trvuu"
D) gravitatiorlnl
11. The gravitational
:- ,- .^^- two
r\^rolmassive spheres
force between
them
'i"tH{i3,llX[,il:'il:
be*veen
distances
the
t]
liil#";,
,,*l.l;;;'Fj,:fi
ffiil*iffi""**''r*r
masses?
A)40N
B)20N
C)5N
D) 2.5N
i&fiil?:"il:"1#T:$':
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A)40N
B)20N
C )5 N
D) 2'5 N
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P er i o d
Date
Ghapter Test
Gravitational Interactions
TRUE OR FALSEOUESTIONS
Circle the correct answer.
1. For some massivestars,gravitationalcollapsedoesn'tstop until the density
of the star becomesso enormous that even light cannot escape.Such a star
becomesa black hole.
T
F
2 . The sun actually pulls harder on the earth'soceansthan the moon.
T
F
3 . If the earth had its presentmass but twice the radius, the accelerationdue to
gravity would increase.
T
F
4 . Becausethe earth has mass,it also has a gravitationalfield.
T
F
5 . If the moon had an ocean as deep as the earth's,tides there would be about
as high as tides on the earth.
MULTIPLECHOICEOUESTIONS
Choose the best answer to each question and write the appropriate letter in
the space provided.
6. The value of the accelerationdue to gravity
A) dependson the radius of the earth.
B) dependson the mass of the earth.
C) is different on different planets.
D) All of the above
7. If the earth had twice its present mass,but the sameradius,what would be
the value of g?
A) 39.2m/s/s
B ) 1 9 . 6m / s / s
C ) 9 . 8m / s / s
D) 4.9mi s/s
8. If the radius of the earth were one half what it is now and the masswere the
same,what would be the value of g?
A) 39.2m/s/s
B ) 1 9 . 6m / s / s
C ) 9 . 8m / s / s
D ) 4 . 9m / s / s
9. The gravitationalfield strength at the center of the earth is
A) great.
B) the same as on the surface.
C) smaller than on the surfacebut still larger than zero.
D) zero.
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Chapter I3 Test
25
-<t-
a
6FAu,,-rrlTiopll "- I,VT tAe/A/ \ t n/
elwator that is acceleratingup\\ a:
i0. If you were to weigh yourself in an
you would weigh
compared to you,"oriinary weight
A) more.
B) the same.
C) less,but more than zero'
D) zero.
elevatorthat is in free fall' compa:
11. If you were to weigh yourself in an
your ordinary weight' you would welgn
A) more.
B) the same
C) less,but more than zero'
D) zero.
12. Oceantides occur mainly because
of the earth away from the sun'
A) water normally runs to the side
ot the earth'
B) of the gravitational pull of the tYt.
moon on opposite sidesof tt
the
of
c) of differe", gr"i,*i""Jpuils
earth'
water somewhatbehind ii
D) as the earth rotates it leavesthe ocean
13. A solar ecliPseoccurswhen
the moon'
A) the sun is between the earth and
the sun'
and
;j ;h" moon is between the earth
and the sun'
Ci ,h. earth is between the moon
MATH PROBLEMS
the spaceprovided' Show all worA
Solve the fotlowing prohlems in
that of earth' and its radius is at
14. Iupiter has a mass about 300 times
be the approximateweight c
1l times that of the earth' What would
1-kg rock on the surfaceof JuPiter?
abovethe earths surface'which
15. Satellitescommonly orbit 6+Okm
of the earth'sgravitationa
of the earths radius'What is the strength
g, in satellite territory?
ESSAYOUESTION
the foltowing question'
On a separate sheet of paper' answer
into-ahole bored completelythr:
I6. Supposeyou droppedan object
what would happen to the ol
center or tn" eurti"t"o"t;; ;,li;. side.
The least?\Mhereis velocin'
\.Mhereis the accele;;til"" the largest?
largest?The least?
26
ChaPter13Test
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CHAPTER
'Rc-, Atto
,..;
Essay
"falling,"
16. The man is
or accelerating,
around the earth. Eventhough the
speedof the moon in orbit is relatively
constant,its direction is continually
changing.This is becauseof the
attraction between the earth and
moon. The velocity of the moon is
perpendicular to the radius of its
orbit. This means it is parallel or tangent to the earth'ssurface,and is
appropriately called tangential velocity. It is becauseof the moon's tangential velocity that it doesn'tcrash into
the earth.
True or False
1 F
2 . F
3 . 7
4 . 7
5 . 7
Multiple Choice
6 . c
7. d
B . b
9 . d
10. c
1 1 .b
12. a
13.d
GHAPTER13
Math
1 4 . 3 . 0m
15. 0.48m
Essay
16. Torque is what givesan object rotational acceleration.It is defined as the
product of a force times the lever arm
between the point of application of
the force and a pivot point or axis.
\Alhentwo people sit on a seesaweach
personexertsan oppositetorque on
the seesawone to producea clockwise rotation and the other to produce
a counterclockwiserotation. Balance
is achievedwhen the two torques have
the samemagnitude.A mobile is a
good exampleof many balanced"seesaws"joined together.
CHAPTER
12
True or False
l . T
2 . F
3 . F
4 . 7
5 . 7
Multiple Ghoice
6 . b
7. d
B . d
9 . b
10. d
ir. d
12. a
13. d
Math
t4. 8
15.1/9
Ansrvers
[Ffsl,ry
'
'Tr'1
(-.'f')n'J
./'
J
r
True or False
1 . 7
2 . 7
3 . F
4 . 7
5 . F
Multiple Choice
6 . d
7. b
B . a
9 . d
10. a
1 1 .d
12. c
13. b
Math
14. 25 N
15. B N/kg
Essay
16.The objectwould pick up speeduntil it
reachedthe centerof the earth.The
object'sspeedwould reach a maximum
as it passesthrough the center and
would begin decreasingas it traveled
beyond the center of the earth. The
object'sspeedwould continueto
decreaseuntil it reachedthe other side
of the earth.At that point, its speed
would momentarily be zero and it
would changedirection and start accelerating towards the center of the earth
again.The object would oscillateback
and forth indefinitely if friction were
absent.Its accelerationwould be greatest near the surfaceof the earth, while
its speedwould be greatestat the center
of the earth. Its accelerationwould be
zero at the center of the earth, while its
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