Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
1.
|
Which
of the following choices best represents force? a. | a push or a pull always causing
motion | b. | a push or a pull always causing
acceleration | c. | a push or a pull acting without an
object | d. | a push or a pull acting on an object | | |
|
|
|
2.
|
Which
of the following best determines the net force when more than one force is acting on an
object? a. | a combination of
all motions of an object | b. | a combination of all motions of an object in two
directions | c. | a combination of all forces acting on an
object | d. | a combination of forces acting on an object in two
directions | | |
|
|
|
3.
|
When
the net forces equal 0 N, they are which of the following? a. | balanced | c. | a
push | b. | unbalanced | d. | a
pull | | | | |
|
|
|
4.
|
Which
of the following always causes change in speed, direction, or both? a. | balanced
forces | c. | either balanced
or unbalanced forces | b. | unbalanced forces | d. | any combination of forces | | | | |
|
|
|
5.
|
Which
of the following causes an object to start moving? a. | balanced
forces | c. | either balanced
or unbalanced forces | b. | unbalanced forces | d. | any combination of forces | | | | |
|
|
|
6.
|
What
is a force that opposes motion between two surfaces that are in contact? a. | friction | c. | velocity | b. | motion | d. | acceleration | | | | |
|
|
|
7.
|
Which
are the two factors that determine the amount of friction? a. | the force and
the roughness of the surfaces | b. | hills and valleys and the roughness of the
surfaces | c. | the force and how much surfaces come in
contact | d. | the force and the weight exerted on the
surfaces | | |
|
|
|
8.
|
Which
of these is opposed by static friction? a. | a pencil rolling on a table | c. | a chair sliding on a floor | b. | a dog running in
a yard | d. | a worker pushing
on a non-moving box | | | | |
|
|
|
9.
|
In
which of the following activities is friction helpful? a. | engine parts
wearing out | c. | soil
erosion | b. | car tires moving a car forward | d. | holes developing in your socks | | | | |
|
|
|
10.
|
In
which of the following activities is friction harmful? a. | brakes stopping
a car | c. | an eraser
erasing | b. | a person walking | d. | car engine parts wearing out | | | | |
|
|
|
11.
|
The
force of gravity a. | is not related
to the mass of the objects. | b. | is only related to the mass of large
objects. | c. | is related to the weight of the
objects. | d. | is related to the mass of the
objects. | | |
|
|
|
12.
|
As
the distance between two objects increases, the force of gravity between them a. | decreases. | c. | increases only
slightly. | b. | does not change. | d. | increases greatly. | | | | |
|
|
|
13.
|
Which
of the following does NOT describe weight? a. | changes as gravitational force
changes | c. | is a measure of
gravitational force | b. | is constant | d. | can be measured in newtons | | | | |
|
|
|
14.
|
The
gravitational pull is greater between two objects that a. | have greater
masses. | c. | are farther
apart. | b. | have rougher surfaces. | d. | are moving at greater speed. | | | | |
|
|
|
15.
|
What
is the net force on an object when you combine a force of 10 N north with a force of 5 N
south? a. | 5 N
south | c. | 50 N
north | b. | 15 N north | d. | 5 N north | | | | |
|
|
|
16.
|
Mass
is a. | different on the
moon than on Earth. | c. | a measure of the
amount of matter. | b. | a measure of gravitational
force. | d. | measured in
newtons. | | | | |
|
|
|
17.
|
When
a mover puts furniture on wheels, which type of friction is the mover using to make the job
easier? a. | static
friction | c. | rolling kinetic
friction | b. | sliding kinetic friction | |
|