Chapter 13 Practice Test: The Nature of Forces
Multiple Choice Section
Choose the response which best completes the following statements or
answers the
following questions.
1. Which of the following statements is FALSE?
(1.) Friction is a retarding force that slows
down the force being applied.
(2.) Temperature is a vector quantity.
(3.) Gravity is a vector quantity.
(4.) Friction always acts in an opposite
direction from the direction of motion.
2. A net force acting on a moving object causes the object
to (1.) fall (2.) accelerate
(3.) stop (4.) curve
3. A 100 kilogram lead block is pushed on a level surface
with an acceleration of 4 m/s2.
With what force is this block pushed?
(1.) 25 N. (2.) 25 m/s (3.) 400 N. (4.) 400 m/s
4. What is the only downward force acting on a freely falling
object? (1.) Inertia
(2.) Acceleration (3.)
Friction (4.) Gravity
5. Which of these opposes acceleration of a falling object
due to gravity?
(1.) momentum (2.)
air resistance (3.) reaction force (4.) terminal
velocity
6. Any push or pull is called (1.) work (2.) distance (3.) power (4.) force
7. According to Newton's second law, acceleration depends
on the size of the force and
the ______ of an object.
(1.) mass (2.) momentum (3.) velocity
(4.) weight
8. A 10 kilogram object is pushed at an acceleration of 20 m/s/s.
What is the force needed to push this object? (1.)
2,000 N. (2.) 200 N
(3.) 2 N (4.)
25 N
9. What force causes a leaf to fall more slowly than a penny?
(1.) gravity (2.) momentum
(3.) inertia (4.) air resistance
10. Which best illustrates Newton's third law? (1.)
projectile motion in zero gravity
(2.) circular motion
(3.) rocket propulsion (4.) centripetal force
11. The resistance of an object to changes in its motion
is referred to as the
property of (1.) friction
(2.) weight (3.) terminal velocity (4.) inertia
12. _____ is reached when air resistance and force due to
gravity are equal in size.
(1.) Negative acceleration
(2.) Terminal velocity (3.) Centripetal acceleration
(4.) Weightlessness
13. The measure of the force of gravitation upon a mass
is called that object's (1.) work (2.) inertia
(3.) mass (4.)
weight
14. Which least effects the amount of air resistance that
acts on an object?
(1.) mass
(2.) size (3.) shape
(4.) speed
15. Acceleration toward the center of a curved or circular
path is (1.) positive acceleration
(2.) negative acceleration
(3.) centripetal acceleration (4.) zero acceleration
16. A motionless object has no (1.) mass (2.) weight (3.) momentum (4.) inertia
17. The momentum of a large truck is _____ that of a small
car traveling at the same speed.
(1.) greater than
(2.) equal to (3.) less than (4.) none of
the above
18. Force is expressed in units of (1.) kg (2.) m/s (3.) m/s2 (4.) kg × m/s2
19. Newton's second law can be expressed in equation form
as (1.) v = d/t
(2.) a = Dv/t
(3.) F = ma (4.) p = mv
20. Near Earth's surface, gravity causes all falling objects
to accelerate at
(1.) 9.8 m/s
(2.) 9.8 m/ s2 (3.) 98 m/s (4.) 98 m/ s2
21. What is the highest velocity that will be reached by
a falling object called?
(1.) terminal velocity
(2.) maximum velocity (3.) mach one
(4.) maximum speed of acceleration
22. A ball thrown horizontally from shoulder height will
hit the ground _______ a ball dropped
from the same height.
(1.) before (2.) at the same time as (3.) after
(4.) harder than
23. ______ are human-made devices that orbit Earth for a
specific purpose.
(1.) Natural satellites
(2.) Artificial satellites (3.) Comets (4.)
Centripetal forces
24. The unit kg × m/s. is the unit for (1.) force (2.) momentum (3.) velocity (4.) acceleration
25. The law of conservation of momentum states that the
total amount of momentum of a group of
objects does not change
unless (1.) outside forces act on the objects
(2.) the objects are not
moving (3.) the objects have different masses
(4.) the objects exert forces
on their surroundings
Short Answer Section : Answer on a separate sheet or the back of this paper.
1. Find the weight in Newtons of a 60 kg woman on
the surface of the Earth.
(Hint: Remember weight is the force
of gravity!)
2. State each of Newton's Three Laws AND a practical example
of each of these laws in nature.
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