Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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A speed-time graph shows that a car moves at 10 m/s for 10 s. The car’s
speed then steadily decreases until it comes to a stop at 30 s. Which of the following describes the
slope of the speed-time graph from 10 s to 30 s?
a. | linear, horizontal | c. | linear, sloping downward | b. | curved,
upward | d. | linear, sloping
upward |
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2.
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An object that is accelerating may be
a. | slowing down. | c. | changing direction. | b. | gaining speed. | d. | all of the
above |
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3.
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A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How
can the train’s acceleration be described?
a. | The train’s acceleration is positive. | b. | The train is not
accelerating. | c. | The train will come to rest in 6 minutes. | d. | The train’s
acceleration is negative. |
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4.
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What is instantaneous acceleration?
a. | how fast a speed is changing at a specific instant | b. | how fast a velocity
is changing at a specific instant | c. | how fast a direction is changing at a specific
instant | d. | all of the above |
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5.
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Which of the following statements is true?
a. | An object that is accelerating is always changing direction. | b. | An object has an
instantaneous acceleration, even if the acceleration vector is zero. | c. | An object at rest
has an instantaneous acceleration of zero. | d. | Instantaneous acceleration is always
changing. |
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Completion
Complete each
statement.
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6.
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The motion of an object looks different to observers in different
______________________________.
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7.
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The SI unit for measuring ____________________ is the meter.
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8.
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The direction and length of a straight line from the starting point to the
ending point of an object’s motion is ____________________.
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9.
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Displacement and velocity are examples of ____________________ because they have
both magnitude and direction.
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10.
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The sum of two or more vectors is called the _________________________.
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11.
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Speed is measured in units of _________________________.
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12.
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A car’s speedometer measures _________________________.
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13.
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 is the equation that defines
_________________________.
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14.
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A constant slope on a distance-time graph indicates ____________________
speed.
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15.
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The difference between speed and velocity is that velocity indicates the
____________________ of motion and speed does not.
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16.
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A distance-time graph indicates an object moves 20 km in 4 h. The average speed
of the object is ____________________ km/h.
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17.
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Because its ____________________ is always changing, an object moving in a
circular path experiences a continuous change in velocity.
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18.
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Two or more velocities add by _________________________.
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19.
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A moving object does not ____________________ if its velocity remains
constant.
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20.
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Freely falling objects accelerate at 9.8 m/s2 because the force of
____________________ acts on them.
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21.
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The velocity of an object moving in a straight line changes at a constant rate
when the object is experiencing constant ____________________.
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22.
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The acceleration of a moving object is calculated by dividing the change in
____________________ by the time over which the change occurs.
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23.
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Accelerated motion is represented by a(an) ____________________ line on a
distance-time graph.
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24.
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A car that increases its speed from 20 km/h to 100 km/h undergoes
____________________ acceleration.
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25.
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______________________________ is how fast a velocity is changing at a specific
instant.
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