Physics 121 Exam 1 Question and
answers already passed 2025
Velocity - correct answer ✔change in position/ change in time
vector
'Going 25 mph and north'
Magnitude of Velocity is speed
For the case of 1-dimensional motion, is it possible for an object
to move in such a way that the distance it covers is:
1.) greater than the magnitude of its displacement,
2.) less than the magnitude of its displacement, or
3.) equal to the magnitude of its displacement?
A. Only 1 and 2 are possible
B. Only 1 and 3 are possible
C. Only 2 and 3 are possible
D. Only 1 is possible
E. All three scenarios are possible - correct answer ✔B
Uniform motion - correct answer ✔-Motion at a constant speed in a straight
line
-Equal displacements in equal time intervals
, -Straight line on a graph
Non-uniform motion - correct answer ✔-Unequal displacements in equal time
intervals
-x vs. t graph is NOT a straight line.
• Displacements for any two equal time intervals are NOT the same
• Slope of a straight line between xf and xi = Average Velocity
*Connects the dots= slope is velocity
-For small Δt, even non-uniform motion becomes nearly uniform.
Newton's 1st Law - correct answer ✔(Law of Inertia) an object in motion
tends to stay in motion & an object at rest stays at rest unless acted upon by
an outside force.
Newton's Second Law - correct answer ✔Force equals mass times
acceleration
Newton's Third Law - correct answer ✔For every action there is an equal and
opposite reaction
Intensive quality - correct answer ✔The variable (inside the system) that
does not depend on the
volume of the system
Extensive quality - correct answer ✔-The variable/s (inside the system) that
DOES depend on the volume of the system
-Ex: the number of passengers on the bus. This number is extensive because
depends on how big the bus is, the amount of people can be in it
answers already passed 2025
Velocity - correct answer ✔change in position/ change in time
vector
'Going 25 mph and north'
Magnitude of Velocity is speed
For the case of 1-dimensional motion, is it possible for an object
to move in such a way that the distance it covers is:
1.) greater than the magnitude of its displacement,
2.) less than the magnitude of its displacement, or
3.) equal to the magnitude of its displacement?
A. Only 1 and 2 are possible
B. Only 1 and 3 are possible
C. Only 2 and 3 are possible
D. Only 1 is possible
E. All three scenarios are possible - correct answer ✔B
Uniform motion - correct answer ✔-Motion at a constant speed in a straight
line
-Equal displacements in equal time intervals
, -Straight line on a graph
Non-uniform motion - correct answer ✔-Unequal displacements in equal time
intervals
-x vs. t graph is NOT a straight line.
• Displacements for any two equal time intervals are NOT the same
• Slope of a straight line between xf and xi = Average Velocity
*Connects the dots= slope is velocity
-For small Δt, even non-uniform motion becomes nearly uniform.
Newton's 1st Law - correct answer ✔(Law of Inertia) an object in motion
tends to stay in motion & an object at rest stays at rest unless acted upon by
an outside force.
Newton's Second Law - correct answer ✔Force equals mass times
acceleration
Newton's Third Law - correct answer ✔For every action there is an equal and
opposite reaction
Intensive quality - correct answer ✔The variable (inside the system) that
does not depend on the
volume of the system
Extensive quality - correct answer ✔-The variable/s (inside the system) that
DOES depend on the volume of the system
-Ex: the number of passengers on the bus. This number is extensive because
depends on how big the bus is, the amount of people can be in it
