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8th Grade Newton's Laws Test-Modified

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 
 
nar001-1.jpg
Figure 2
 

 1. 

Refer to Figure 2. Which pair of force vectors represents an object that is accelerating to the right?
a.
pair A
c.
pair C
b.
pair B
 

 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.
long-range
 

 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.
 

 



 
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