BYT1 PHYS 2300
Physics Mechanics
FA REVIEW
©WGU 2024/2025
,1. Multiple Choice: What is the principle behind the conservation
of mechanical energy in a closed system?
a) Energy cannot be created or destroyed, only transformed.
b) Energy is always conserved in the presence of non-conservative
forces.
c) Energy can be created in an isolated system.
d) Energy is not conserved in any system.
Correct Answer: a) Energy cannot be created or destroyed, only
transformed.
Rationale: The principle of conservation of mechanical energy
states that in an isolated system not subject to non-conservative
forces (like friction), the total mechanical energy remains constant.
2. Fill-in-the-Blank: The _______ of an object is directly
proportional to the net force acting on it and inversely proportional
to its mass.
Correct Answer: acceleration
Rationale: According to Newton's second law of motion, the
acceleration of an object is directly proportional to the net force
acting on it and inversely proportional to its mass (F=ma).
3. True/False: The angular momentum of a system remains
constant if the net external torque acting on the system is zero.
©WGU 2024/2025
, Correct Answer: True
Rationale: This statement is true according to the law of
conservation of angular momentum, which states that if no external
torque acts on a system, its angular momentum remains constant.
4. Multiple Response: Which of the following are scalar quantities?
(Select all that apply)
a) Velocity
b) Speed
c) Force
d) Temperature
e) Energy
Correct Answers: b) Speed, d) Temperature, e) Energy
Rationale: Scalar quantities have magnitude only and do not have
direction, which applies to speed, temperature, and energy.
Velocity and force are vector quantities, which have both
magnitude and direction.
5. Multiple Choice: In a collision where momentum is conserved,
which of the following is also conserved?
a) Kinetic energy only
b) Mass only
c) Both kinetic energy and mass
©WGU 2024/2025
Physics Mechanics
FA REVIEW
©WGU 2024/2025
,1. Multiple Choice: What is the principle behind the conservation
of mechanical energy in a closed system?
a) Energy cannot be created or destroyed, only transformed.
b) Energy is always conserved in the presence of non-conservative
forces.
c) Energy can be created in an isolated system.
d) Energy is not conserved in any system.
Correct Answer: a) Energy cannot be created or destroyed, only
transformed.
Rationale: The principle of conservation of mechanical energy
states that in an isolated system not subject to non-conservative
forces (like friction), the total mechanical energy remains constant.
2. Fill-in-the-Blank: The _______ of an object is directly
proportional to the net force acting on it and inversely proportional
to its mass.
Correct Answer: acceleration
Rationale: According to Newton's second law of motion, the
acceleration of an object is directly proportional to the net force
acting on it and inversely proportional to its mass (F=ma).
3. True/False: The angular momentum of a system remains
constant if the net external torque acting on the system is zero.
©WGU 2024/2025
, Correct Answer: True
Rationale: This statement is true according to the law of
conservation of angular momentum, which states that if no external
torque acts on a system, its angular momentum remains constant.
4. Multiple Response: Which of the following are scalar quantities?
(Select all that apply)
a) Velocity
b) Speed
c) Force
d) Temperature
e) Energy
Correct Answers: b) Speed, d) Temperature, e) Energy
Rationale: Scalar quantities have magnitude only and do not have
direction, which applies to speed, temperature, and energy.
Velocity and force are vector quantities, which have both
magnitude and direction.
5. Multiple Choice: In a collision where momentum is conserved,
which of the following is also conserved?
a) Kinetic energy only
b) Mass only
c) Both kinetic energy and mass
©WGU 2024/2025
