Physics Test 12A
 
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Physics Test 12A

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

 1. 
If you are given the mass of an object in pounds, the time in seconds, and the distance in feet, what must you do before you can calculate the momentum in SI units?
a.
convert the mass to kilograms
c.
Both (a) and (b)
b.
convert the distance to meters
d.
None of the above
 

 2. 
Of the following, the greatest gravitational force would occur between
a.
a marble and a baseball 5 meters apart.
b.
a loaded freighter on the high seas and Earth.
c.
the moon and an astronaut standing on the moon.
d.
the moon and Earth.
 

 3. 
The law that states that every object maintains constant velocity unless acted on by an unbalanced force is
a.
Newton’s first law of motion.
b.
Newton’s second law of motion.
c.
Newton’s third law of motion.
d.
the law of conservation of momentum.
 

 4. 
The law that states that for every action force there is an equal and opposite reaction force is
a.
Newton’s first law of motion.
b.
Newton’s second law of motion.
c.
Newton’s third law of motion.
d.
the law of conservation of momentum.
 

 5. 
The law that states that the unbalanced force acting on an object equals the object’s mass times its acceleration is
a.
Newton’s first law of motion.
b.
Newton’s second law of motion.
c.
Newton’s third law of motion.
d.
the law of conservation of momentum.
 

 6. 
One pound is equal to how many newtons?
a.
4.448 N
c.
0.225 N
b.
2.2 N
d.
12.5 N
 

 7. 
Which of the following equations is correct?
a.
w = mg
c.
w = g/m
b.
w = m/g
d.
w = g + m
 

 8. 
What is the approximate terminal velocity of a sky diver before the parachute opens?
a.
32 mi/h
c.
320 mi/h
b.
32 km/h
d.
320 km/h
 

 9. 
Earth pulls on the moon and holds the moon in its orbit. The moon pulls on Earth with an equal and opposite force. This is an example of
a.
Newton’s first law.
c.
Newton’s third law.
b.
Newton’s second law.
d.
None of the above
 

 10. 
What is the unbalanced force that slows down a ball rolling across the floor?
a.
the force of friction
c.
the force of inertia
b.
the force of gravity
d.
the force of momentum
 

 11. 
If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after the collision?
a.
the law of conservation of momentum
b.
the law of universal gravitation
c.
Newton’s third law
d.
Newton’s second law
 

 12. 
Express the following as an equation: One newton is the force that can give an object with a mass of 1 kg an acceleration of 1 m/s2.
a.
1 N = 1 kg ÷ 1 m/s2
c.
1 N = 1 m/s2 ÷ 1 kg
b.
1 N ´ 1 kg = 1 m/s2
d.
1 N = 1 kg ´ 1 m/s2
 

 13. 
When gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called?
a.
resultant velocity
c.
instantaneous velocity
b.
terminal velocity
d.
average velocity
 

 14. 
In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height?
a.
The book would accelerate twice as fast as the rock.
b.
The rock would accelerate twice as fast as the book.
c.
The book would accelerate ten times as fast as the rock.
d.
They would not differ; they would be the same.
 

 15. 
What happens immediately after a sky diver opens her parachute?
a.
Air resistance greatly increases.
b.
The sky diver is in free fall.
c.
The sky diver’s speed greatly increases.
d.
The force of gravity greatly increases.
 

 16. 
Which statement illustrates Newton’s first law?
a.
A stone will not move unless something pushes or pulls it.
b.
A ball rolling across the floor eventually slows down.
c.
As a car comes to a stop, the passengers continue to move forward.
d.
All of the above
 

 17. 
Which object has the greatest inertia?
a.
a tennis ball
c.
a beach ball
b.
a bowling ball
d.
a volleyball
 

 18. 
What force causes a skater sliding on the ice to gradually slow down?
a.
a balanced force
c.
friction
b.
inertia
d.
acceleration
 

 19. 
A seat belt helps you when your car stops suddenly by providing a(n)
a.
balanced forward force.
c.
balanced backward force.
b.
unbalanced forward force.
d.
unbalanced backward force.
 

 20. 
One newton is the force that can give a mass of 1 kg an acceleration of
a.
1 m/s.
c.
1 m/s2.
b.
9.8 m/s.
d.
9.8 m/s2.
 

 21. 
Which of the following will result in the greatest acceleration?
a.
56 N acting on a 1-kg box
c.
23 N acting on a 2-kg box
b.
56 N acting on a 2-kg box
d.
23 N acting on a 5-kg box
 

 22. 
What unbalanced force is needed to give a 976 kg vehicle an acceleration of 2.50 m/s2?
a.
3.90 ´ 102 N
c.
2.44 ´ 103 N
b.
3.90 ´ 102 lb
d.
2.44 ´ 103 lb
 

 23. 
A force of 240.0 N causes an object to accelerate at 3.2 m/s2. What is the mass of the object?
a.
0.013 kg
c.
240 kg
b.
75 kg
d.
768 kg
 

 24. 
A 0.25 kg steel ball experiences a net force of 1.15 N as it rolls down a ramp. What is the acceleration of the ball?
a.
0.29 m/s2
c.
1.4 m/s2
b.
0.90 m/s2
d.
4.6 m/s2
 

 25. 
If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have _____ acceleration as (than) Car B.
a.
the same
c.
less
b.
greater
d.
the opposite
 

 26. 
The gravitational force between two objects depends on masses of objects and
a.
accelerations of objects.
c.
speeds of objects.
b.
distance between objects.
d.
sizes of objects.
 

 27. 
Which of the following objects exerts a gravitational force?
a.
a bowling ball
c.
a feather
b.
a book
d.
All of the above
 

 28. 
Increasing which of these conditions results in more gravitational force between two objects?
a.
distance
c.
mass
b.
acceleration
d.
surface area
 

 29. 
When an object is in free fall, the only force acting on it is
a.
gravity.
c.
inertia.
b.
friction.
d.
terminal velocity.
 

 30. 
Free-fall acceleration near Earth’s surface
a.
depends on an object’s weight.
c.
depends on an object’s mass.
b.
is the same for all objects.
d.
None of the above
 



 
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