Transcript Circular Motion - college physics

Physics Quiz
CIRCULAR MOTION
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1. How many degrees are there in p radians?
A. 90
B. 53
C. 45
D. 180
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2. A particular sector of a a circle of radius 2 m spans an arc of 1.5
radians. What is the arclength (curved outer edge) of the sector?
A. p m
B. 1 m
C. 3 m
D. 2 m
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3. Rotational motion may be analyzed with the same kinematic
equations as linear motion under what condition?
A. the angular acceleration is constant
B. the angular velocity is constant
C. there is no linear motion
D. the angular acceleration is zero
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4. What is centripetal acceleration?
A. the acceleration of an object moving about a circular path
B. the component of an object`s acceleration directed toward
the center of the circular path about which it is moving
C. the angular acceleration of a rotating object
D. the outward component of a rotating object`s acceleration
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5. What effect listed below is not manifested on an object in circular
motion due to the tangential component of its acceleration?
A. its angular speed changes
B. its centripetal acceleration changes
C. its direction changes
D. its speed changes
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6. Which of the following equations is incorrect?
A.
v2
ac 
r
B.
a  at2  ac2
C.
at  r
D.
  0

2
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7. What is centrifugal force?
A. an apparent or factious force
B. the net force that pulls you to the inside of a turn
C. the net force that pulls you to the outside of a turn
D. the net force acting in all cases
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8. What is centripetal force?
A. an apparent or factious force
B. the net force that pulls you to the inside of a turn
C. the net force that pulls you to the outside of a turn
D. the net force acting in all cases
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9. Is centripetal force a unique force like tension, gravity, or friction?
A. no
B. yes
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10. Which of the vectors in the diagram shows the direction of the
centripetal force acting on the object in circular motion?
circular path
A. A
B. B
C
C. C
B
object
D. none are correct
A
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11. A mass of 2 kg moves with a speed of 2 m/s about a circular
path of 2 m radius. What is the magnitude of the centripetal force
acting on it?
A. 4 N
B. 8 N
C. 2 N
D. 16 N
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12. A roller coaster goes out of control and just makes it around a
circular loop at minimum speed. A the very top of the loop, when the
car is up-side-down, what is the magnitude of the normal force
exerted by the track and acting on the car?
A. the weight of the car
B. zero
C. minus the weight of the car
D. twice the weight of the car
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13. An object in free fall may travel along which of the following
paths, given the right conditions?
A. a line
B. an ellipse
C. a parabola
D. all of the above
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14. When an object under the influence of gravity experiences large
changes in radial displacement so that its free fall acceleration can
not be approximated as constant , what will its potential energy be?
A. G
B.
Mm
r2
Mm
G
r
Mm
G
C.
r
M  mass of Earth
m  mass of object
r  distance between M and m
Mm
D. G 2
r
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15. Which is more dangerous to Earth?
A. Being struck by an asteroid whose orbit crosses Earth`s.
B. Being struck by an asteroid but coming in from outside the
Solar System.
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16. What is the definition of escape velocity?
A. the minimum velocity needed to lift off a planet`s surface
B. the minimum velocity needed to get into orbit about a planet
C. the velocity needed to make if far away (∞) from a planet
with a constant speed and never return
D. the velocity needed to make it far away (∞) from a planet
with zero speed and never return
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17. If you go around a loop of radius 5 m on a roller coaster ride
and experience twice your weight at the top of the loop when you
are upside down, what is your speed?
A. 7.0 m/s
B. 9.9 m/s
C. 4.4 m/s
D. 12.1 m/s
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18. A certain asteroid is in orbit about the sun with an orbital radius
3.2 times that of Earth`s. How many years does it take the asteroid
to complete one orbit?
A. 2.2 years
B. 3.2 years
C. 5.7 years
D. 1.8 years
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