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



 Figure
2  


1.

Refer to Figure 2. Which pair of force vectors represents an object that is
accelerating to the right?


2.

The relationship among force, mass, and acceleration is stated in _____.
a.  the law of conservation of momentum  c.  Newton's second law of
motion  b.  Newton's first law of motion 


3.

The statement "to every action there is an equal and opposite
reaction" is a statement of _____.
a.  Newton's third law  c.  Newton's first
law  b.  the law of conservation of momentum 


4.

Forces that are equal in size but opposite in direction are ____.
a.  balanced forces  c.  inertial forces  b.  frictional
forces 


5.

Whenever a body is in motion, there is always ____ to oppose the motion.
a.  friction  c.  gravity  b.  inertia 


6.

The statement "for every action, there is an equal but opposite
reaction" is a statement of ____.
a.  Newton's third law  b.  the law of conservation of
momentum  c.  Newton's second law 


7.

The unit of force is ____.
a.  the newton  c.  the joule  b.  m/s 


8.

An unbalanced force acting on an object causes it to ____.
a.  accelerate  c.  continue in a straight line  b.  move at constant
speed 


9.

The force that opposes motion is ____.
a.  friction  c.  an unbalanced force  b.  an accelerating
force 


10.

Every force has a(n) ____ force.
a.  reaction  c.  opposite  b.  longrange 


11.

You throw a ball into the air. As the ball leaves your hand, the force(s) acting
on it is/are ____.
a.  gravity and your hand  c.  gravity  b.  balanced 


12.

A centripetal force holds the planets of the solar system in orbit about the
Sun. This force is the result of ____
a.  acceleration.  c.  vectors.  b.  gravity. 


13.

A skier is carried by the lift to the top of a ski run. Before he
starts down the slope, what type of energy does the skier possess?
a.  kinetic  c.  potential  b.  gravitational 

Completion Complete each
statement.


14.

Speeding up, slowing down, and going around curves are examples of
____________________.


15.

If you are riding on a skateboard and it stops suddenly, your body keeps moving
forward. This is because of ____________________.


16.

A(n) ____________________ is a push or a pull.


17.

According to Bernoulli’s principle, faster moving air over a wing causes
_______.


18.

Whan calculating the trajoctory of a projectile, you must have the initial
velocities for the horizontal and _________ directions.


19.

From the top of a slope, the skier’s speed increases as he descends.
Because of this, his __________ energy converts to _________ energy.


20.

In Newton’s Second Law, the _____________ of an object related to the
amount and direction that a force is applied.


21.

To reduce friction between moving objects, a ___________ can be
used.
