PHY 121 CSU Exam 1 Questions with
complete solution 2025
Particle models - correct answer ✔-represents a moving object as if all its
mass were concentrated at a single point
Motion diagrams - correct answer ✔-dots indicate an object's positions at
successive times
-time intervals between successive dots is always the same
Scalar quantities - correct answer ✔-have only a magnitude and can be
represented by a single number
-Temperature, time, and mass are scalars
Vectors - correct answer ✔-a quantity described by both magnitude and
direction
-velocity and displacement are vectors
Velocity vectors - correct answer ✔-can be drawn on a motion diagram by
connecting successive points with a vector
Position - correct answer ✔-the location of an object, with respect to
coordinate system
-described by a coordinate
Displacement - correct answer ✔-a change in position
-a quantity when studied along a line
-ΔX=Xf−Xi
, Time - correct answer ✔-measured from where/when we assign t=0
Time interval - correct answer ✔-elapsed time between two different times
-ΔT=Tf−Ti
Velocity - correct answer ✔-the ratio of the displacement to the time interval
when the displacement occurs
-V=Δx/Δt
SI Units - correct answer ✔Length: meters (m)
Time: seconds (s)
Mass: kilograms (kg)
Significant figures - correct answer ✔-Multiplication, division, and powers: set
by the value with the fewest significant figures.
-Addition and subtraction: set by the value with the smallest number of
decimal places.
Acceleration - correct answer ✔-the rate of change in velocity
-Ax = ΔVx / Δt
-units are m/s^2
Position vs time graph - correct answer ✔-plots position on Y and time on X
Velocity vs time graph - correct answer ✔-plots velocity on Y and time on X
complete solution 2025
Particle models - correct answer ✔-represents a moving object as if all its
mass were concentrated at a single point
Motion diagrams - correct answer ✔-dots indicate an object's positions at
successive times
-time intervals between successive dots is always the same
Scalar quantities - correct answer ✔-have only a magnitude and can be
represented by a single number
-Temperature, time, and mass are scalars
Vectors - correct answer ✔-a quantity described by both magnitude and
direction
-velocity and displacement are vectors
Velocity vectors - correct answer ✔-can be drawn on a motion diagram by
connecting successive points with a vector
Position - correct answer ✔-the location of an object, with respect to
coordinate system
-described by a coordinate
Displacement - correct answer ✔-a change in position
-a quantity when studied along a line
-ΔX=Xf−Xi
, Time - correct answer ✔-measured from where/when we assign t=0
Time interval - correct answer ✔-elapsed time between two different times
-ΔT=Tf−Ti
Velocity - correct answer ✔-the ratio of the displacement to the time interval
when the displacement occurs
-V=Δx/Δt
SI Units - correct answer ✔Length: meters (m)
Time: seconds (s)
Mass: kilograms (kg)
Significant figures - correct answer ✔-Multiplication, division, and powers: set
by the value with the fewest significant figures.
-Addition and subtraction: set by the value with the smallest number of
decimal places.
Acceleration - correct answer ✔-the rate of change in velocity
-Ax = ΔVx / Δt
-units are m/s^2
Position vs time graph - correct answer ✔-plots position on Y and time on X
Velocity vs time graph - correct answer ✔-plots velocity on Y and time on X
