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8th Grade Chapters 2 & 3 Test Re-take

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 falling?
a.
pair A
c.
pair D
b.
pair C
d.
pair B
 

 2. 

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

 3. 

If gravity did not affect the path of a horizontally thrown ball, the ball would ____.
a.
travel horizontally
c.
follow a curved path
b.
go straight up
d.
fall straight down
 

 4. 

An unbalanced force acting on an object causes it to ____.
a.
accelerate
c.
move at constant speed
b.
continue in a straight line
d.
not change its velocity
 

 5. 

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

 6. 

Every force has a(n) ____ force.
a.
accelerating
c.
reaction
b.
long-range
d.
opposite
 

 7. 

When two birds are pulling on a worm and the worm moves toward the first bird, you know that the forces are ____.
a.
balanced
c.
unbalanced
b.
long-range
d.
action-reaction
 

 8. 

A student sees a motionless ball resting on a table. Which of the following best describes the forces acting on the ball?
a.
Gravity is creating a downward force that is equal to the force of the table pushing up.
b.
The table is creating a downward force that holds the ball in place.
c.
Forces cannot be acting on the ball because it is not moving.
d.
Air resistance is holding the ball in place by opposing static friction.
 

 9. 

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

 10. 

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

 11. 

Which statement best describes how the mass of an object affects the amount of force needed to move the object?
a.
There is no relationship between mass and force.
b.
Larger masses require more force to move.
c.
Less force is needed to move larger masses.
d.
The mass of an object is equal to the force needed to move it.
 

 12. 

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

 13. 

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

 14. 

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

 15. 

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

 16. 

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

 17. 

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

 18. 

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

Completion
Complete each statement.
 

 19. 

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

 

 20. 

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

 

 21. 

All objects in motion experience multiple forces.  If a car is moving in a forward motion, it expereiences the oppositional forces of rolling and fluid friction.  To acelerate, the motor must overcome those forces with it’s own force.  The overall force the car expereiences is called the ______ force.
 

 

 22. 

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

 

 23. 

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

 

 24. 

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

 

 25. 

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

 

 26. 

When there is no change in motion, the forces acting on the object must be _________.
 

 

 27. 

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

 

 28. 

Friction always acts in a direction ____________________ to the direction of motion.
 

 

 29. 

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

 



 
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