PHY 121 CSU Exam Questions with Verified
Correct Answers
Particle models
-represents a moving object as if all its mass were concentrated at a single point
Motion diagrams
-dots indicate an object's positions at successive times
-time intervals between successive dots is always the same
Scalar quantities
-have only a magnitude and can be represented by a single number
-Temperature, time, and mass are scalars
Vectors
-a quantity described by both magnitude and direction
-velocity and displacement are vectors
Velocity vectors
-can be drawn on a motion diagram by connecting successive points with a vector
Position
-the location of an object, with respect to coordinate system
-described by a coordinate
Displacement
, -a change in position
-a quantity when studied along a line
-ΔX=Xf−Xi
Time
-measured from where/when we assign t=0
Time interval
-elapsed time between two different times
-ΔT=Tf−Ti
Velocity
-the ratio of the displacement to the time interval when the displacement occurs
-V=Δx/Δt
SI Units
Length: meters (m)
Time: seconds (s)
Mass: kilograms (kg)
Significant figures
-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 Answers
Particle models
-represents a moving object as if all its mass were concentrated at a single point
Motion diagrams
-dots indicate an object's positions at successive times
-time intervals between successive dots is always the same
Scalar quantities
-have only a magnitude and can be represented by a single number
-Temperature, time, and mass are scalars
Vectors
-a quantity described by both magnitude and direction
-velocity and displacement are vectors
Velocity vectors
-can be drawn on a motion diagram by connecting successive points with a vector
Position
-the location of an object, with respect to coordinate system
-described by a coordinate
Displacement
, -a change in position
-a quantity when studied along a line
-ΔX=Xf−Xi
Time
-measured from where/when we assign t=0
Time interval
-elapsed time between two different times
-ΔT=Tf−Ti
Velocity
-the ratio of the displacement to the time interval when the displacement occurs
-V=Δx/Δt
SI Units
Length: meters (m)
Time: seconds (s)
Mass: kilograms (kg)
Significant figures
-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
