PHY 121 FINAL EXAM REVIEW QUESTIONS AND ANSWERS
GRADED A+ 2025/2026
A potential energy function for system 1 is given by
u1(x)=cx2+bx3. The potential energy function for system 2 is given
by u2(x)=a+cx2+bx3, where a is a positive quantity. How does the
force on system 1 relate to the force on system 2 at a given
position?
A) the force on the two systems will be in opposite directions.
B) the force is identical on the two systems.
C) there is no relationship between the forces on the two
systems.
D) the force on the second system will be with greater than the
force on the first system.
E) the force on the second system will be with less than the
force on the first system.
B) the force is identical on the two systems.
Two identical balls are thrown vertically upward. The second ball
is thrown with an initial speed that is twice that of the first ball.
How does the maximum height of the two balls compare?
,A) the maximum height of the second ball is four times that of
the first ball.
B) the maximum height of the second ball is two times that of the
first ball.
C) the maximum height of the second ball is eight times that of
the first ball.
D) the maximum heights of the two balls are equal.the maximum
height of the second ball is 1.41 times that of the first ball.
A) the maximum height of the second ball is four times that of
the first ball.
A ball drops some distance and gains 30 j of kinetic energy. Do
not ignore air resistance. How much gravitational potential
energy did the ball lose?
A) exactly 30 j
B) less than 30 j
C) more than 30 j
C) more than 30 j
,A 1.0-kg block and a 2.0-kg block are pressed together on a
horizontal frictionless surface with a compressed very light
spring between them. They are not attached to the spring. After
they are released and have both moved free of the spring
A) the heavier block will have more kinetic energy than the
lighter block.both blocks will both have the same amount of
kinetic energy.
B) the lighter block will have more kinetic energy than the
heavier block.
C) the magnitude of the momentum of the heavier block will be
greater than the magnitude of the momentum of the lighter
block.
D) both blocks will have equal speeds.
B) the lighter block will have more kinetic energy than the
heavier block.
When a constant force acts on an object, what does the object's
change in momentum depend upon?
Check all that apply.
A) the change in momentum depends upon the change in the
velocity of the object.
, B) the change in momentum depends upon the time interval
during which the force acts.
C) the change in momentum depends upon the magnitude of the
force.
D) the change in momentum depends upon the change in the
position of the object.
E) the change in momentum depends upon the mass of the
object.
A) the change in momentum depends upon the change in the
velocity of the object
In a perfectly elastic collision between two perfectly rigid objects
A) the kinetic energy of each object is conserved.the momentum
of each object is conserved.
B) the kinetic energy of the system is conserved, but the
momentum of the system is not conserved.
C) both the momentum and the kinetic energy of the system are
conserved.
D) the momentum of the system is conserved but the kinetic
energy of the system is not conserved.
C) both the momentum and the kinetic energy of the system are
conserved.
GRADED A+ 2025/2026
A potential energy function for system 1 is given by
u1(x)=cx2+bx3. The potential energy function for system 2 is given
by u2(x)=a+cx2+bx3, where a is a positive quantity. How does the
force on system 1 relate to the force on system 2 at a given
position?
A) the force on the two systems will be in opposite directions.
B) the force is identical on the two systems.
C) there is no relationship between the forces on the two
systems.
D) the force on the second system will be with greater than the
force on the first system.
E) the force on the second system will be with less than the
force on the first system.
B) the force is identical on the two systems.
Two identical balls are thrown vertically upward. The second ball
is thrown with an initial speed that is twice that of the first ball.
How does the maximum height of the two balls compare?
,A) the maximum height of the second ball is four times that of
the first ball.
B) the maximum height of the second ball is two times that of the
first ball.
C) the maximum height of the second ball is eight times that of
the first ball.
D) the maximum heights of the two balls are equal.the maximum
height of the second ball is 1.41 times that of the first ball.
A) the maximum height of the second ball is four times that of
the first ball.
A ball drops some distance and gains 30 j of kinetic energy. Do
not ignore air resistance. How much gravitational potential
energy did the ball lose?
A) exactly 30 j
B) less than 30 j
C) more than 30 j
C) more than 30 j
,A 1.0-kg block and a 2.0-kg block are pressed together on a
horizontal frictionless surface with a compressed very light
spring between them. They are not attached to the spring. After
they are released and have both moved free of the spring
A) the heavier block will have more kinetic energy than the
lighter block.both blocks will both have the same amount of
kinetic energy.
B) the lighter block will have more kinetic energy than the
heavier block.
C) the magnitude of the momentum of the heavier block will be
greater than the magnitude of the momentum of the lighter
block.
D) both blocks will have equal speeds.
B) the lighter block will have more kinetic energy than the
heavier block.
When a constant force acts on an object, what does the object's
change in momentum depend upon?
Check all that apply.
A) the change in momentum depends upon the change in the
velocity of the object.
, B) the change in momentum depends upon the time interval
during which the force acts.
C) the change in momentum depends upon the magnitude of the
force.
D) the change in momentum depends upon the change in the
position of the object.
E) the change in momentum depends upon the mass of the
object.
A) the change in momentum depends upon the change in the
velocity of the object
In a perfectly elastic collision between two perfectly rigid objects
A) the kinetic energy of each object is conserved.the momentum
of each object is conserved.
B) the kinetic energy of the system is conserved, but the
momentum of the system is not conserved.
C) both the momentum and the kinetic energy of the system are
conserved.
D) the momentum of the system is conserved but the kinetic
energy of the system is not conserved.
C) both the momentum and the kinetic energy of the system are
conserved.
