Phys 165 Module 3 Exam Solved
Correctly To Score A+
What is the branch of classical mechanics concerned with the study of forces and their
effects on motion called? CORRECT ANSWERS Dynamics
Which of the following is the BEST description of a force? CORRECT ANSWERS a)
simply a push or a pull
b) an action exerted on an object which may change the object's state of rest or motion
c) something only found in sci-fi movies
d) A and B
Answer A and B
What is the unit for force? CORRECT ANSWERS Newtons
What is the specific, immediate, identifiable cause of a force called? CORRECT
ANSWERS Agent of Force
When a baseball player hits a home run, what is the agent of the force applied to the
ball? CORRECT ANSWERS The bat
What makes a field force different from a contact force when it comes to agents and
receivers of forces? CORRECT ANSWERS In field forces the agent and receiver of the
force do not have to touch, but in contact forces the agent and receiver of the force
must touch
Draw a Free Body Diagram of a picture resting on a shelf. Then answer the following
questions about your free body diagram:
a. How many forces are in your diagram?1. 1 2. 2 3. 3 4. 4
b. In which direction does the shelf apply a force on the picture?1. Upward2.
Downward3. There is not enough information to determine the direction 4. The table
does not apply a force to the laptop
c. How does the magnitude of the weight of the picture compare to the magnitude of the
normal force acting on the picture? 1. The weight of the picture is larger than the normal
force acting on the picture 2. The normal force acting on the picture is larger than the
weight of the picture 3. Both the normal force and the weight of the picture have the
same magnitude 4. There is not enough information to compare the magnitude of these
forces. CORRECT ANSWERS a) 2
b) 1
c) 3
, Draw a Free Body Diagram of a crate being pushed horizontally across a horizontal
floor by a person at a constant speed. Then answer the following questions about your
free body diagram:
a. How many forces are in your Free Body Diagram?1. 12. 23. 34. 4
b. How does the magnitude of the crate's weight compare to the magnitude of the
normal force acting on the crate? 1. The weight of the crate is larger than the normal
force acting on the crate 2. The normal force acting on the crate is larger than the
weight of the crate 3. The magnitudes of these forces are the same 4. There is not
enough information to compare the magnitudes of these forces
c. How does the magnitude of the force applied by the person onto the crate compare to
the magnitude of the frictional force acting on the crate? 1. The force applied by the
person is larger than the frictional force acting on the crate. 2. The frictional force acting
on the crate CORRECT ANSWERS a) 4
b) 3
c) 3
d) 5
Draw a Free Body Diagram of a car coasting to the right across a level road and slowing
down. Then answer the following questions about your free body diagram:
a. How many forces are in your Free Body Diagram?1. 1 2. 2 3. 3 4. 4
b. How does the magnitude of the car's weight compare to the magnitude of the normal
force acting on the car? 1. The weight of the car is larger than the normal force acting
on the car 2. The normal force acting on the car is larger than the weight of the car 3.
The magnitudes of these forces are the same 4. There is not enough information to
compare the magnitudes of these forces
c. How does the magnitude of the net force acting on the car compare to the magnitude
of the frictional force applied onto the car? 1. The net force acting on the car is larger
than the frictional force acting on the car. 2. The frictional force acting on the car is
larger than the net force acting on the car 3. The CORRECT ANSWERS a) 3
b) 3
c) 3
What is the definition of inertia? CORRECT ANSWERS Inertia is the property of an
object which resists any change in the object's motion
Which one of the following statements is NOT part of the Law of Inertia? CORRECT
ANSWERS For every action, there is an equal but opposite reaction
Which of the following is a description of acceleration according to Newton's Second
Law of Motion? Acceleration _________. CORRECT ANSWERS Is directly proportional
to the net force acting on the system
Which of the following is NOT true about actions and reactions according to the Law of
Interaction? CORRECT ANSWERS Actions and reactions act on the same system
Correctly To Score A+
What is the branch of classical mechanics concerned with the study of forces and their
effects on motion called? CORRECT ANSWERS Dynamics
Which of the following is the BEST description of a force? CORRECT ANSWERS a)
simply a push or a pull
b) an action exerted on an object which may change the object's state of rest or motion
c) something only found in sci-fi movies
d) A and B
Answer A and B
What is the unit for force? CORRECT ANSWERS Newtons
What is the specific, immediate, identifiable cause of a force called? CORRECT
ANSWERS Agent of Force
When a baseball player hits a home run, what is the agent of the force applied to the
ball? CORRECT ANSWERS The bat
What makes a field force different from a contact force when it comes to agents and
receivers of forces? CORRECT ANSWERS In field forces the agent and receiver of the
force do not have to touch, but in contact forces the agent and receiver of the force
must touch
Draw a Free Body Diagram of a picture resting on a shelf. Then answer the following
questions about your free body diagram:
a. How many forces are in your diagram?1. 1 2. 2 3. 3 4. 4
b. In which direction does the shelf apply a force on the picture?1. Upward2.
Downward3. There is not enough information to determine the direction 4. The table
does not apply a force to the laptop
c. How does the magnitude of the weight of the picture compare to the magnitude of the
normal force acting on the picture? 1. The weight of the picture is larger than the normal
force acting on the picture 2. The normal force acting on the picture is larger than the
weight of the picture 3. Both the normal force and the weight of the picture have the
same magnitude 4. There is not enough information to compare the magnitude of these
forces. CORRECT ANSWERS a) 2
b) 1
c) 3
, Draw a Free Body Diagram of a crate being pushed horizontally across a horizontal
floor by a person at a constant speed. Then answer the following questions about your
free body diagram:
a. How many forces are in your Free Body Diagram?1. 12. 23. 34. 4
b. How does the magnitude of the crate's weight compare to the magnitude of the
normal force acting on the crate? 1. The weight of the crate is larger than the normal
force acting on the crate 2. The normal force acting on the crate is larger than the
weight of the crate 3. The magnitudes of these forces are the same 4. There is not
enough information to compare the magnitudes of these forces
c. How does the magnitude of the force applied by the person onto the crate compare to
the magnitude of the frictional force acting on the crate? 1. The force applied by the
person is larger than the frictional force acting on the crate. 2. The frictional force acting
on the crate CORRECT ANSWERS a) 4
b) 3
c) 3
d) 5
Draw a Free Body Diagram of a car coasting to the right across a level road and slowing
down. Then answer the following questions about your free body diagram:
a. How many forces are in your Free Body Diagram?1. 1 2. 2 3. 3 4. 4
b. How does the magnitude of the car's weight compare to the magnitude of the normal
force acting on the car? 1. The weight of the car is larger than the normal force acting
on the car 2. The normal force acting on the car is larger than the weight of the car 3.
The magnitudes of these forces are the same 4. There is not enough information to
compare the magnitudes of these forces
c. How does the magnitude of the net force acting on the car compare to the magnitude
of the frictional force applied onto the car? 1. The net force acting on the car is larger
than the frictional force acting on the car. 2. The frictional force acting on the car is
larger than the net force acting on the car 3. The CORRECT ANSWERS a) 3
b) 3
c) 3
What is the definition of inertia? CORRECT ANSWERS Inertia is the property of an
object which resists any change in the object's motion
Which one of the following statements is NOT part of the Law of Inertia? CORRECT
ANSWERS For every action, there is an equal but opposite reaction
Which of the following is a description of acceleration according to Newton's Second
Law of Motion? Acceleration _________. CORRECT ANSWERS Is directly proportional
to the net force acting on the system
Which of the following is NOT true about actions and reactions according to the Law of
Interaction? CORRECT ANSWERS Actions and reactions act on the same system
