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


1.

Speed is
a.  a measure of how fast something is moving.  b.  always measured in
terms of a unit of distance divided by a unit of time.  c.  the distance covered per unit
time.  d.  all of the above.  e.  none of the
above. 


2.

One possible unit of speed is
a.  miles per hour.  b.  light years per century.  c.  kilometers per
hour.  d.  all of the above.  e.  none of the
above. 


3.

When you look at the speedometer in a moving car, you can see the car's
a.  average distance traveled.  b.  instantaneous acceleration.  c.  average
speed.  d.  instantaneous speed.  e.  average
acceleration. 


4.

A train travels 6 meters in the first second of travel, 6 meters again during
the second second of travel, and 6 meters again during the third second. Its acceleration is
a.  0 m/s^{2}.  b.  6 m/s^{2}.  c.  12
m/s^{2}.  d.  18 m/s^{2}.  e.  none of the
above 


5.

A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the
car’s average acceleration?
a.  0.17 m/s^{2}  b.  1.67 m/s^{2}  c.  6
m/s^{2}  d.  7 m/s^{2}  e.  none of the
above 


6.

As an object falls freely in a vacuum, its
a.  velocity increases.  b.  acceleration increases.  c.  both A and B.
 d.  none of the above. 


7.

In the absence of air resistance, objects fall at constant
a.  speed.  b.  velocity.  c.  acceleration.  d.  distances each successive
second.  e.  all of the above 


8.

If you drop a feather and a coin at the same time in a tube filled with air,
which will reach the bottom of the tube first?
a.  The feather  b.  Neither—they will both reach the bottom
at the same time.  c.  The coin 


9.

Suppose you take a trip that covers 180 km and takes 3 hours to make. Your
average speed is
a.  30 km/h.  b.  60 km/h.  c.  180
km/h.  d.  360 km/h.  e.  540 km/h. 


10.

Suppose a car is moving in a straight line and steadily increases its speed. It
moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is
the car's acceleration?
a.  5 km/h·s  b.  10 km/h·s  c.  35
km/h·s  d.  40 km/h·s  e.  45 km/h·s 


11.

A ball is thrown straight up. At the top of its path its instantaneous speed is
a.  0 m/s.  b.  about 5 m/s.  c.  about 10
m/s.  d.  about 20 m/s.  e.  about 50 m/s. 


12.

A ball is thrown straight up. At the top of its path its acceleration is
a.  0 m/s^{2}.  b.  about 5 m/s^{2}.  c.  about 10
m/s^{2}.  d.  about 20 m/s^{2}.  e.  about 50
m/s^{2}. 


13.

A freely falling object starts from rest. After falling for 6 seconds, it will
have a speed of about
a.  6 m/s.  b.  30 m/s.  c.  60
m/s.  d.  300 m/s.  e.  more than 300
m/s. 


14.

If you drop a feather and a coin at the same time in a vacuum tube, which will
reach the bottom of the tube first?
a.  Neitherthey will both reach the bottom at the same time.  b.  The
coin  c.  The feather 

True/False Indicate whether the
statement is true or false.


15.

The rate at which distance is covered is called speed.


16.

Average speed is defined as the time it takes for a trip divided by the
distance.


17.

Velocity is different from speed in that velocity is speed in a given
direction.


18.

The rate at which velocity changes with time is called acceleration.


19.

When a car rounds a corner at a constant speed, its acceleration is zero.


20.

Even though a car is slowing down, it is still accelerating, in the most general
definition of acceleration.
