PHYS 165 Module 5 Examination – Physics:
Portage Learning – 2026/2027 Academic Year
Total Questions: 84 | Time Allowed: 2 hours | Total Points: 100
Instructions: Select the best answer for each multiple-choice question. For
true/false questions, indicate whether the statement is true or false. For calculation
questions, show your work and provide the final answer with appropriate units.
Question 1
What is the product of an object's mass and velocity called?
A) Force
B) Impulse
C) Momentum
D) Energy
Answer: C) Momentum
Rationale: Momentum is defined as the product of an object's mass and its
velocity (p = mv). Force is mass times acceleration, impulse is force times time,
and energy is the capacity to do work.
Question 2
What is the symbol for momentum?
A) J
B) P
C) F
D) M
Answer: B) P
Rationale: The standard symbol for momentum in physics is p (or P). Impulse is
represented by J, force by F, and mass by m.
,Question 3
What are the SI units for momentum?
A) N·s
B) kg·m/s
C) J·s
D) kg·m/s²
Answer: B) kg·m/s
Rationale: Momentum is mass (kg) times velocity (m/s), giving units of kg·m/s.
N·s is the unit for impulse, which is equivalent but not the standard expression for
momentum.
Question 4
Is momentum a vector or scalar quantity?
A) Scalar
B) Vector
C) Neither
D) Both
Answer: B) Vector
Rationale: Momentum is a vector quantity because it has both magnitude and
direction, following the direction of the velocity.
Question 5
True or False: An object at rest has zero momentum.
Answer: True
Rationale: Since momentum p = mv, if velocity v = 0, then momentum p = 0
regardless of the object's mass.
Question 6
, Which of the following has the greatest momentum?
A) A 1,000 kg car moving at 2 m/s
B) A 100 kg person running at 10 m/s
C) A 10 kg bicycle moving at 25 m/s
D) A 2,000 kg truck at rest
Answer: A) A 1,000 kg car moving at 2 m/s
Rationale: Calculate each: A) p = 1000 × 2 = 2,000 kg·m/s; B) p = 100 × 10 =
1,000 kg·m/s; C) p = 10 × 25 = 250 kg·m/s; D) p = 0. The car has the greatest
momentum.
Question 7
What happens to the momentum of an object if its mass is doubled while its
velocity remains constant?
A) It is halved
B) It remains the same
C) It is doubled
D) It is quadrupled
Answer: C) It is doubled
Rationale: Momentum p = mv. If mass m doubles and velocity v stays constant,
momentum p doubles proportionally.
Question 8
True or False: Momentum is always conserved in any collision.
Answer: False
Rationale: Momentum is conserved only in closed systems where no external
forces act. In real-world collisions with external forces (like friction), momentum
may not be perfectly conserved.
Question 9
Portage Learning – 2026/2027 Academic Year
Total Questions: 84 | Time Allowed: 2 hours | Total Points: 100
Instructions: Select the best answer for each multiple-choice question. For
true/false questions, indicate whether the statement is true or false. For calculation
questions, show your work and provide the final answer with appropriate units.
Question 1
What is the product of an object's mass and velocity called?
A) Force
B) Impulse
C) Momentum
D) Energy
Answer: C) Momentum
Rationale: Momentum is defined as the product of an object's mass and its
velocity (p = mv). Force is mass times acceleration, impulse is force times time,
and energy is the capacity to do work.
Question 2
What is the symbol for momentum?
A) J
B) P
C) F
D) M
Answer: B) P
Rationale: The standard symbol for momentum in physics is p (or P). Impulse is
represented by J, force by F, and mass by m.
,Question 3
What are the SI units for momentum?
A) N·s
B) kg·m/s
C) J·s
D) kg·m/s²
Answer: B) kg·m/s
Rationale: Momentum is mass (kg) times velocity (m/s), giving units of kg·m/s.
N·s is the unit for impulse, which is equivalent but not the standard expression for
momentum.
Question 4
Is momentum a vector or scalar quantity?
A) Scalar
B) Vector
C) Neither
D) Both
Answer: B) Vector
Rationale: Momentum is a vector quantity because it has both magnitude and
direction, following the direction of the velocity.
Question 5
True or False: An object at rest has zero momentum.
Answer: True
Rationale: Since momentum p = mv, if velocity v = 0, then momentum p = 0
regardless of the object's mass.
Question 6
, Which of the following has the greatest momentum?
A) A 1,000 kg car moving at 2 m/s
B) A 100 kg person running at 10 m/s
C) A 10 kg bicycle moving at 25 m/s
D) A 2,000 kg truck at rest
Answer: A) A 1,000 kg car moving at 2 m/s
Rationale: Calculate each: A) p = 1000 × 2 = 2,000 kg·m/s; B) p = 100 × 10 =
1,000 kg·m/s; C) p = 10 × 25 = 250 kg·m/s; D) p = 0. The car has the greatest
momentum.
Question 7
What happens to the momentum of an object if its mass is doubled while its
velocity remains constant?
A) It is halved
B) It remains the same
C) It is doubled
D) It is quadrupled
Answer: C) It is doubled
Rationale: Momentum p = mv. If mass m doubles and velocity v stays constant,
momentum p doubles proportionally.
Question 8
True or False: Momentum is always conserved in any collision.
Answer: False
Rationale: Momentum is conserved only in closed systems where no external
forces act. In real-world collisions with external forces (like friction), momentum
may not be perfectly conserved.
Question 9
