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Physics Unit 03 Newton's Laws of Motion Flashcards | StudBud
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Physics Unit 03 Newton's Laws of Motion
Physics Unit 03 Newton's Laws of Motion
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Answers
1
True or False? The pair of forces in an interaction happen simultaneously.
True
False
2
A force is necessary to produce a curved path with a moving object.
True
False
3
If the force of air resistance = weight of an object, then acceleration stops at
drag
lift
free fall
Terminal speed
4
Which is normally less, static friction or sliding friction on the same object?
Sliding friction
Static friction
5
Any influence that can cause an object to be accelerated, measured in newtons, is called a __________.
free fall
force
friction
kilogram
6
Mr. Fowler pushes against a table with a force of 12 N and the table does not move. How great is the force of friction?
12 N
6 N
9.8 N
24 N
7
The acceleration of a 2 kg block on a horizontal table when 14 N is applied and friction is 4 N is
9 m/s^2
7 m/s^2
2 m/s^2
5 m/s^2
8
What is the approximate weight in newtons of a person having a mass of 70 kg?
819 N
700 N
350 N
70 N
9
Net force of a 10-N falling object that encounters 4 N of air resistance is___________.
14 N
9.8 N
10 N
6 N
10
How many forces acting on how many objects are required for an interaction?
Two forces on any number of objects.
Two forces on two different objects.
Two forces on the same object.
One force on one object.
11
Acceleration is equal to net force.
False
True
12
Friction usually affects the net force on an object by
Reversing the net force
Having no effect on net force
Increasing the net force
Reducing the net force
13
Two principal factors affecting the force of air resistance are
Frontal area and weight
Speed and weight
Mass and weight
Frontal area and speed
14
True or False? Birds fly by pushing air downward.
True
False
15
True or False? An object is in equilibrium if it is at rest or if it is moving in a straight line at a constant speed.
True
False
16
If net force is tripled, how does acceleration change?
Acceleration triples.
Acceleration remains constant.
Object enters free fall.
Acceleration decreases to one third.
17
The Standard International Unit for force is the ________________.
Kilogram
Newton
Meter
Second
18
Mass is the measure of an object’s ____________, or resistance to change in motion.
Net force
Weight
Terminal speed
Inertia
19
How does direction of acceleration compare to direction of net force?
Opposite direction
Perpendicular
Same direction
Directions are independent
20
True or False? Newton said that neither force has to be identified as "action" or "reaction".
False
True
21
Weight and mass are directly proportional.
False
True
22
True or False? If a body is at rest, then no forces are acting on it.
True
False
23
Acceleration is inversely proportional to mass.
True
False
24
If a book that weighs 15 N is at rest on a flat table, how many newtons of support force does the table provide?
15
9.8
25
0
25
A person weighing 250 newtons has an approximate mass of ______________.
9.8 kg
250 kg
125 kg
25 kg
26
The acceleration of a 2,000 kg single- engine airplane just before takeoff with 500 N of thrust is ______.
19600 m/s^2
5 m/s^2
0.25 m/s^2
2000 m/s^2
27
True or False? When an object falls in air, then the net force equals weight minus air resistance.
False
True
28
The resistive force that opposes motion of an object either past another object or through a fluid is called __________.
Free fall
Weight
Friction
Acceleration
29
The horizontal force needed to produce a 10.0 m/s^2 acceleration on a 1.2 kg puck on a friction-free air table is
8.3 N
12.0 N
1.0 N
10.0 N
30
The Standard International Unit for mass is the _________________.
Meter
Newton
Second
Kilogram
