Name: 
 

Test: Chapters 1 and 2


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

 1 
A rule or principle that describes what happens in nature is a ____.
a.
hypothesis
c.
problem
b.
scientific law
d.
theory
 

 2 
If the falling object in the diagram below is in dynamic equilibrium, what is the net force?
mc002-1.jpg
a.
equal to the mass of the object
b.
equal to the force of gravity on the object
c.
the sum of the force of gravity and resistance force
d.
equal to the force of resistance on the object
 

 3 
A standard for comparison that helps to ensure that the experimental result is caused by the condition being tested is the ____.
a.
constant
c.
dependent variable
b.
control
d.
hypothesis
 

 4 
What is the minimum resultant possible when adding a 6-N force to an 8-N force?
a.
6 N
b.
8 N
c.
2 N
d.
48 N
e.
14 N
 

 5 
Equilibrium occurs when
a.
the net force on the object is zero.
b.
the sum of the +x forces on an object equals the sum of the –x forces.
c.
all the forces acting on an object are balanced.
d.
the sum of the upward forces equals the sum of the downward forces.
e.
all of the above
 

 6 
Burl and Paul have combined weights of 1300 N. The tensions in the supporting ropes that support the scaffold they stand on add to 1700 N. The weight of the scaffold itself must be 
a.
500 N
b.
3000 N
c.
400 N
d.
600 N
 

 7 
One benefit of the SI system is that it is ____.
a.
based on units of 100
c.
not used in the United States
b.
based on multiples of ten
d.
not used to measure temperature
 

 8 
A boy whose weight is 580 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand?
a.
580 N.
b.
0 N.
c.
1160 N.
d.
870 N.
e.
290 N.
 

 9 
A variable in an experiment that stays the same is a(n) ____.
a.
dependent variable
c.
constant
b.
control
d.
independent variable
 

 10 
The correct symbol for the SI unit of temperature is ____.
a.
ºF
c.
K
b.
ºC
d.
s
 

 11 
The prefix kilo- means ____.
a.
100
c.
1,000
b.
0.01
d.
0.001
 

 12 
Which one of the following steps is NOT a part of the scientific method?
a.
Formulate a general rule based on the predictions and experimental outcome.
b.
Perform experiments to test the predictions.
c.
Repeat the experiments until the answers match the predictions.
d.
Recognize a problem.
e.
Make a guess about the answer to a problem and predict its consequences.
 

 13 
What is needed to describe a vector quantity?
a.
only magnitude
b.
neither magnitude nor direction
c.
both magnitude and direction
d.
only direction
 

 14 
In a graph showing temperature change of a material over time, temperature change is the ____.
a.
independent variable
c.
variable with the smallest range
b.
variable with the largest range
d.
dependent variable
 

 15 
The difference between a hypothesis and a theory is that a hypothesis is
a.
never true whereas a theory is always true.
b.
never true whereas a theory is sometimes true.
c.
an isolated fact whereas a theory is a huge collections of facts.
d.
an educated guess whereas a theory has been tested successfully many times in many ways.
e.
true whereas a theory is not true.
 

 16 
What is the net force on the object below/
mc016-1.jpg
a.
10 N
b.
15 N
c.
0 N
d.
5 N
 

 17 
A 13-N force and a 24-N force act in the same direction on an object. What is the net force on the object?
a.
24 N
b.
13 N
c.
37 N
d.
11 N
e.
none of the above
 

 18 
You are helping your aunt move a piano on wheels from one room to another. When you push the piano horizontally, it moves at constant speed. What can you say about the piano?
a.
It is in equilibrium because it doesn’t experience a friction force.
b.
It is in equilibrium because it experiences net force opposite to the friction force.
c.
It is in dynamic equilibrium.
d.
It is in static equilibrium.
 

 19 
What is the maximum resultant possible when adding a 6-N force to a 11-N force?
a.
66 N
b.
6 N
c.
17 N
d.
11 N
e.
5 N
 

 20 
The variable plotted on the horizontal or x-axis is called the ____.
a.
variable with the largest range
c.
dependent variable
b.
variable with the smallest range
d.
independent variable
 

 21 
The SI unit that is used to measure time is the ____.
a.
kilogram
c.
second
b.
meter
d.
kelvin
 

 22 
What is the name of the force that acts opposite to the weight in the diagram below called?
mc022-1.jpg
a.
Earth force
b.
Normal force
c.
Support force
d.
both b and c
 

 23 
A prediction about a problem that can be tested is a(n) ____.
a.
control
c.
independent variable
b.
hypothesis
d.
dependent variable
 

 24 
An explanation of an event that is based on repeated observations and experiments is a ____.
a.
hypothesis
c.
theory
b.
problem
d.
scientific law
 

 25 
What is the tension force on each of the spring scales in the diagram below?
mc025-1.jpg
a.
10 N
b.
20 N
c.
5 N
d.
15 N
 

 26 
A scalar quantity has
a.
both magnitude and direction.
b.
only direction.
c.
only magnitude.
d.
neither magnitude nor direction.
 

 27 
A 20-N force and a 35-N force act on an object in opposite directions. What is the net force on the object?
a.
55 N
b.
35 N
c.
15 N
d.
20 N
e.
none of the above
 

 28 
The process of gathering information through the senses is called ____.
a.
inference
c.
observation
b.
analysis
d.
hypothesis
 

 29 
When a desk is horizontally pushed across a floor at a steady speed in a straight-line direction, the amount of friction acting on the desk is
a.
dependent on the speed of the sliding crate.
b.
less than the pushing force.
c.
equal to the pushing force.
d.
greater than the pushing force.
 

 30 
Studying the effect of one thing on another in order to test a hypothesis is a(n) ____.
a.
constant
c.
problem
b.
exercise
d.
experiment
 



 
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