PHYS 2425 I: FINAL Questions with
complete solution 2025/2026
True or False: Accuracy refers to how close a measurement os to the true value - correct answer ✔True
A kind of analogy or mental image of a phenomenon in terms of something we are familiar with referred
to as a - correct answer ✔Model
What happens to the speed of a ball after it is thrown upward into the air? (Neglect air resistance) -
correct answer ✔Decrease and then increase
For a projectile launched horizontally, the horizontal component of a projectile's velocity - correct
answer ✔remains non-zero constant
You throw a football to your friend. When the football reachers its maximum altitude, it velocity is -
correct answer ✔horizontal
Galileo's Law of Inertia is the same as - correct answer ✔Newton's first law
Under which of the following conditions is the magnitude of the average velocity of a particle moving in
one dimension smaller than the average speed over the time interval? - correct answer ✔a particle
moves in the +x direction and then reverses the direction of its motion
You press your physics textbook flat against a vertical wall with your hand. What is the direction of the
friction force exerted by the wall on the book? - correct answer ✔Upward
The total mechanical energy of a system - correct answer ✔is constant, only if conservative forces act.
, An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U. - correct answer ✔K
increases and U decreases
If the net work done on an object is zero, then the object's kinetic energy - correct answer ✔remains
the same
What type of acceleration does an object moving with constant speed in a circular path experience? -
correct answer ✔Centripetal acceleration
Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an axial spin
rate 1/2 that of Earth. With g representing, as usual, the acceleration due to gravity on the surface of
Earth, the acceleration due to gravity on the surface of Z-34 is - correct answer ✔3 g
A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that - correct
answer ✔a frictional force acting on it
List the four fundamental forces of nature - correct answer ✔gravitational, electromagnetic, strong
nuclear, weak nuclear
Does the centripetal force acting on an object do work on the object? - correct answer ✔No, because
the force and the displacement of the object are perpendicular
A person applies a constant force of 20 N to a rock of mass 1000 kg, for a total of 20 seconds. What is
the work done by this person if the rock does not move at all by this applied force? - correct answer ✔0
J
Because earth's orbit is slightly elliptical, earth actually gets closer to the sun during part of the year.
When earth is closer to the sun its orbital speed is - correct answer ✔greater than when earth is
farthest away from the sun
complete solution 2025/2026
True or False: Accuracy refers to how close a measurement os to the true value - correct answer ✔True
A kind of analogy or mental image of a phenomenon in terms of something we are familiar with referred
to as a - correct answer ✔Model
What happens to the speed of a ball after it is thrown upward into the air? (Neglect air resistance) -
correct answer ✔Decrease and then increase
For a projectile launched horizontally, the horizontal component of a projectile's velocity - correct
answer ✔remains non-zero constant
You throw a football to your friend. When the football reachers its maximum altitude, it velocity is -
correct answer ✔horizontal
Galileo's Law of Inertia is the same as - correct answer ✔Newton's first law
Under which of the following conditions is the magnitude of the average velocity of a particle moving in
one dimension smaller than the average speed over the time interval? - correct answer ✔a particle
moves in the +x direction and then reverses the direction of its motion
You press your physics textbook flat against a vertical wall with your hand. What is the direction of the
friction force exerted by the wall on the book? - correct answer ✔Upward
The total mechanical energy of a system - correct answer ✔is constant, only if conservative forces act.
, An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U. - correct answer ✔K
increases and U decreases
If the net work done on an object is zero, then the object's kinetic energy - correct answer ✔remains
the same
What type of acceleration does an object moving with constant speed in a circular path experience? -
correct answer ✔Centripetal acceleration
Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an axial spin
rate 1/2 that of Earth. With g representing, as usual, the acceleration due to gravity on the surface of
Earth, the acceleration due to gravity on the surface of Z-34 is - correct answer ✔3 g
A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that - correct
answer ✔a frictional force acting on it
List the four fundamental forces of nature - correct answer ✔gravitational, electromagnetic, strong
nuclear, weak nuclear
Does the centripetal force acting on an object do work on the object? - correct answer ✔No, because
the force and the displacement of the object are perpendicular
A person applies a constant force of 20 N to a rock of mass 1000 kg, for a total of 20 seconds. What is
the work done by this person if the rock does not move at all by this applied force? - correct answer ✔0
J
Because earth's orbit is slightly elliptical, earth actually gets closer to the sun during part of the year.
When earth is closer to the sun its orbital speed is - correct answer ✔greater than when earth is
farthest away from the sun
