PSCI Exam 1 Flashcards
To hit a golf ball farther, you should “follow through the swing”’ because
Of the relationship Δp = Ft
An experimental situation used as the basis of comparison is the
Control group
A block of iron is transported to the Moon. Which of the following is true
Its mass remains the same, but its weight decreases
Which of the following is NOT a SI unit of the property it measures?
volume-liter
Use the graph below to determine what is the speed of the car in section a
Easy graph
Weight is best described as
The downward force exerted on objects due to gravity
The most recently developed scientific theory is
Plate tectonic theory
The English unit of volume closest in size to a liter is
Quart
A statement describing a relationship that is observed in nature to occur consistently time after time is a (an)
Scientific law
Whenever an object is standing still, the value(s) that is/are always zero is/are
All of the above (speed, momentum, velocity)
Gravity is an attractive force between
All objects everywhere
The newton is a unit of
Force
The weight of a 50 kg box is closest to
500 N
Imagine a 10 g chunk of aluminum (r = 2.7 g/cm3) and a 10 g chunk of iron (r = 7.9 g/cm3). Which of the following is true?
The chunk of iron is smaller than the chunk of aluminum
One of the basic differences between science and a pseudoscience is the lack of
Valid and reliable experimental studies
A tentative thought or experiment derived explanation is known as a(an)
Hypothesis
If you consider the total distance and total time for a trip, you are calculating a(an)
Average speed
Everything that happens in the universe can be traced to interactions of
Four fundamental forces
The recreation of an event by comparing two situations in which all the factors are identical except one is called a
Controlled experiment
The property of volume is a measure of
How much space the object occupies
Equations are used to
All of the answers are correct (describe how quantities change together, define a concept, describe a property)
Convert 1,270 millimeters into centimeters
127 cm
In the equation A = πr2, π (pi) is a
Numerical constant
Claims that appear to be pseudoscience should be
Tested experimentally.
Which of the following represents a concept of density?
Compactness
A statement describing a relationship that is observed in nature to occur consistently time after time is a
scientific law.
If a cube of Jell-o is cut into two pieces, what total property of the new pieces change?
surface area
Which of the following is not a SI unit of the property it measures?
volume - liter
When something cannot be directly observed, it can be represented by a
Model
In the text, the equation V = tk is used to describe the relationship between the volume of a gas tank and the time required to fill it. The symbol “k”
is the proportionality constant.
What is the mass in kilograms of gasoline (density = 0.680 g/cm3) in a full 92.1 L gas tank? Be sure your units cancel out.
62.6 ; mass=p (density)*vol
Ignoring air resistance, the velocity of a falling object
is constantly increasing.
The tendency of a moving object to remain in unchanging motion in the absence of an unbalanced force is called
Inertia
The newton is a unit of
Force
If an unbalanced force applied to an object doubles, then
its acceleration doubles.
What force is needed to give a 2,386 kg truck an acceleration of 2.7 m/s 2 over a lever road. Units should be in Newtons.
6,442 ; Force=mass*acceleration (units are in Newtons)
What variable determine your weight?
mass and gravity
Which location would require the greatest mass if the weight of an object is the same in each place?
Earth’s moon
