PHYS165 / PHYS 165 Module 3: (Latest Update
2026 / 2027) Physics | Questions, Answers &
Review Material | Grade A | 100% Correct -
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2026 / 2027 Academic Year
Q: What is the branch of classical mechanics concerned with the study of forces and their effects on
motion called?
Answer:
Dynamics
Q: Which of the following is the BEST description of a force?
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) 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
Q: What is the unit for force?
Answer:
Newtons
Q: In a free body diagram of a box resting on the floor, how many forces would you draw?
A) 1
B) 2
C) 3
D) 4
Answer:
B) 2
Q: What is the specific, immediate, identifiable cause of a force called?
Answer:
Agent of Force
Q: When a baseball player hits a home run, what is the agent of the force applied to the ball?
Answer:
The bat
Q: What makes a field force different from a contact force when it comes to agents and receivers
of forces?
Answer:
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
Q: A force exerted from any surface (the agent) onto an object that is pressing against the given
surface is known as a(n) _______.
A) Normal Force
B) Tension Force
C) Elastic Force
D) Field Force
Answer:
A) Normal Force
Q: Q: The force that acts on an object to resist motion is known as ______________.
A) Normal
B) Friction
C) Inertia
D) Contact
Answer:
B) Friction
Q: The resistive force that occurs when the two surfaces do slide across each other is known as
____________________________.
A) Static Friction
B) Kinetic Friction
A) Static Friction: starting
Answer:
B) Kinetic Friction: sliding
Q: What is the definition of inertia?
Answer:
Inertia is the property of an object which resists any change in the object's motion
Q: Law of Inertia?
Answer:
An object at rest remains at rest and an object in motion stays in motion unless acted on by a net
outside force
Q: Which of the following is a description of acceleration according to Newton's Second Law of
Motion? Acceleration _________.
Answer:
Is directly proportional to the net force acting on the system
Q: Acceleration of an object is directly proportional to the net external force acting on an object
Answer:
Acceleration of an object is inversely proportional to the mass of the object
Acceleration of the object is in the same direction as the net external force
Q: Law of Interaction?
Answer:
For every action, there is an equal but opposite reaction
Q: According to Newton's Third Law of Motion, what is the reaction to a ball being kicked by a
teenager?
Answer:
The ball applies a force to the teenager's foot
Q: True or False: In physics. The Weight and Mass of an object have the same value.
Answer:
False
Q: What is the weight of a 1560 kg car?
Answer:
W=mg
1560 x 9.80= 15,288
15,290 N
Q: When a tugboat pulls a barge with a net force of 842,000 N,
what acceleration will the barge experience if it has a mass of 1,625,000 kg?
Answer:
Use f=ma revise a=Fnet/m
842,000/ 1,625,000 = 0.51815385
0.518 m/s^2
Q: When a 2270 kg car accelerates from rest to 12.0 ms in 2.50 s, what net force acts on the car
during this time?
Answer:
Use a=vf-vi/t answer in m/s^2 Use f=ma answer in N
(12.0 - 0 ) / 2.50 = 4.80
2270 * 4.80 = 10,896
10,900 N
Q: Calculate the spring constant of a spring if it stretches 17.5 cm when a force of 102 N acts on
it.
Answer:
use k=f/x
102/ 17.5=
5.82 N/m
Q: What do physicists call the resistance to motion or attempted motion?
Answer:
Friction, drag or air resistance
Q: Which of the following statements best describes surface friction?
Answer:
When a person slides a crate across the floor and the crate does not move, the crate has kinetic
friction acting on it.
Q: When a person tries to move a crate by pushing it, and it does not move, the crate has static
Answer:
friction acting on it
Q: A factory worker is pushing horizontally on a 92.0-kg wooden create that is sitting at rest on
a wooden horizontal floor. The coefficient of static friction between the crate and the floor is 0.500
and the coefficient of kinetic friction between the crate and the floor is 0.300. Answer the following
questions about this scenario.
A) What is the weight of the crate?
B) What is the maximum static friction force that can act on the crate?
C) What is the kinetic friction force that could act on the crate?
D) When the factory worker pushes with 635 N, what is the net force acting on the crate?
E) When the factory worker pushes with 635 N, what is the acceleration of the crate?
Answer:
a) W=mg Answer in N
W= 92.0 x 9.80 = 901.6 = 902 N
b) Fs= us x N
0. 500 x 902= 451 N
c) Fk= uK x N
0.300 x 902= 271 N
d) Fnet =Fa- Fk
635 - 271 = 364 N
e) a= Fnet/ m 364N/ 92.0kg= 3.96 m/s^2
Q: True or False: When an object is in uniform circular motion its velocity is constant.
Answer:
False
Q: A 38.4-kg child is playing on a Merry-Go-Round that has a diameter of 3.42 m. She is
moving at a uniform tangential speed of 3.32 . Answer the following questions about the child's
motion.
A) Calculate the centripetal acceleration of the child.
B) Calculate the centripetal force acting on the child.
A) aC= V^2/ r
aC= 3.32^2 / 1.71
aC= 6.4458
6.45 m/s ^2
b) Fc= mv^2
Fc= (38.4) (3.32^2)/ 1.71
Fc= 247.5
248 N*
Which of the following is true according to Newton's Universal Law of Gravitation?
Answer:
Gravitational forces are felt between any two masses.
What is the gravitational force between two identical trucks of 19,030 kg separated by 31.00 m?
Answer:
Fg=Gm1 x m2/d^2
Fg= 6.673x10^-11 x (19,030) x (19,030) / 31.00^2
2.51x10^-5
Fg= 2.51x10^-5N
What are the four Fundamental Forces of Nature?
Gravitational
Electromagnetic
Calculate the acceleration due to gravity on the surface of Mercury, given that its mass is 3.18 x 102
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