Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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When an object is moving with uniform circular motion, the object’s
tangential speed
a. | is circular. | b. | is perpendicular to the plane of
motion. | c. | is constant. | d. | is directed toward the center of
motion. |
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2.
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When an object is moving with uniform circular motion, the centripetal
acceleration of the object
a. | is circular. | b. | is perpendicular to the plane of
motion. | c. | is zero. | d. | is directed toward the center of
motion. |
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3.
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What term describes a change in the speed of an object in circular
motion?
a. | tangential speed | c. | centripetal acceleration | b. | tangential
acceleration | d. | centripetal
force |
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4.
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What is the term for the net force directed toward the center of an
object’s circular path?
a. | circular force | c. | centripetal force | b. | centrifugal force | d. | orbital force |
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5.
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Which of the following can be a centripetal force?
a. | friction | c. | tension | b. | gravity | d. | all of the
above |
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6.
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The centripetal force on an object in circular motion is
a. | perpendicular to the plane of the object’s motion. | b. | in the plane of the
object’s motion and perpendicular to the tangential speed. | c. | in the plane of the
object’s motion and in the same direction as the tangential speed. | d. | in the plane of the
object’s motion and in the direction opposite the tangential
speed. |
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7.
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The centripetal force on an object in circular motion is
a. | in the same direction as the tangential speed. | b. | in the direction
opposite the tangential speed. | c. | in the same direction as the centripetal
acceleration. | d. | in the direction opposite the centripetal
acceleration. |
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A child rides a bicycle in a circular path with a radius of 2.0 m. The
tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43
kg.
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8.
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What is the magnitude of the bicycle’s centripetal acceleration?
a. | 1.0 m/s2 | c. | 4.0 m/s2 | b. | 2.0 m/s2 | d. | 8.0
m/s2 |
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9.
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What is the magnitude of the centripetal force on the bicycle?
a. | 4.0 N | c. | 86 N | b. | 43 N | d. | 3.7 kN |
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10.
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What kind of force provides the centripetal force on the bicycle?
a. | gravitational force | c. | air resistance | b. | friction | d. | normal force |
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11.
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When a car makes a sharp left turn, what causes the passengers to move toward
the right side of the car?
a. | centripetal acceleration | c. | centrifugal
force | b. | centripetal force | d. | inertia |
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12.
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A ball is whirled on a string, then the string breaks. What causes the ball to
move off in a straight line?
a. | centripetal acceleration | c. | centrifugal
force | b. | centripetal force | d. | inertia |
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13.
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Tides are caused by
a. | differences in the gravitational force of the sun at different points on
Earth. | b. | differences in the gravitational force of the moon at different points on
Earth. | c. | differences in Earth’s gravitational field strength at different points on
Earth’s surface. | d. | fluctuations in the gravitational attraction
between Earth and the moon. |
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14.
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Why does an astronaut weigh less on the moon than on Earth?
a. | The astronaut has less mass on the moon. | b. | The astronaut is
farther from Earth’s center when he or she is on the moon. | c. | The gravitational
field strength is less on the moon’s surface than on Earth’s surface. | d. | The astronaut is
continually in free fall because the moon orbits Earth. |
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15.
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If you lift an apple from the ground to some point above the ground, the
gravitational potential energy in the system increases. This potential energy is stored in
a. | the apple. | b. | Earth. | c. | both the apple and
Earth. | d. | the gravitational field between Earth and the apple. |
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16.
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An object’s tendency to resist acceleration is measured by the
object’s
a. | gravitational mass. | c. | gravitational field strength. | b. | inertial
mass. | d. | weight. |
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17.
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The degree to which an object attracts other objects is measured by the
object’s
a. | gravitational mass. | c. | gravitational field strength. | b. | inertial
mass. | d. | weight. |
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18.
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Which of the following confirms that gravitational mass and inertial mass are
equivalent?
a. | Free-fall acceleration is the same throughout the universe. | b. | Free-fall
acceleration is the same at all points where the gravitational field strength is the
same. | c. | Newton’s second law is valid throughout the universe. | d. | An object’s
weight can change with location, but the object’s mass remains
constant. |
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19.
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In this text, which of the following symbols represents gravitational field
strength?
a. | F | c. | g | b. | G | d. | F |
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20.
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In this text, which of the following symbols represents the constant of
universal gravitation?
a. | F | c. |
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