Multiple Choice Identify the
choice that best completes the statement or answers the question.


1.

A speedtime 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 speedtime graph from 10 s to 30 s?
a.  linear, horizontal  c.  linear, sloping downward  b.  curved,
upward  d.  linear, sloping
upward 


2.

An object that is accelerating may be
a.  slowing down.  c.  changing direction.  b.  gaining speed.  d.  all of the
above 


3.

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. 


4.

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 


5.

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. 

Completion Complete each
statement.


6.

The motion of an object looks different to observers in different
______________________________.


7.

The SI unit for measuring ____________________ is the meter.


8.

The direction and length of a straight line from the starting point to the
ending point of an object’s motion is ____________________.


9.

Displacement and velocity are examples of ____________________ because they have
both magnitude and direction.


10.

The sum of two or more vectors is called the _________________________.


11.

Speed is measured in units of _________________________.


12.

A car’s speedometer measures _________________________.


13.

is the equation that defines
_________________________.


14.

A constant slope on a distancetime graph indicates ____________________
speed.


15.

The difference between speed and velocity is that velocity indicates the
____________________ of motion and speed does not.


16.

A distancetime graph indicates an object moves 20 km in 4 h. The average speed
of the object is ____________________ km/h.


17.

Because its ____________________ is always changing, an object moving in a
circular path experiences a continuous change in velocity.


18.

Two or more velocities add by _________________________.


19.

A moving object does not ____________________ if its velocity remains
constant.


20.

Freely falling objects accelerate at 9.8 m/s^{2} because the force of
____________________ acts on them.


21.

The velocity of an object moving in a straight line changes at a constant rate
when the object is experiencing constant ____________________.


22.

The acceleration of a moving object is calculated by dividing the change in
____________________ by the time over which the change occurs.


23.

Accelerated motion is represented by a(an) ____________________ line on a
distancetime graph.


24.

A car that increases its speed from 20 km/h to 100 km/h undergoes
____________________ acceleration.


25.

______________________________ is how fast a velocity is changing at a specific
instant.
