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Chapter 2 Vocabulary

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Thought Experiment
an attempt at logically reasoning through what has happened.
Accuracy
how close to the true value, or accepted value, a measurment is.
Precision
the level of detail to which a measurement is taken.
Parallax
the appearance of the shift in position of an object due to an actual shift in the position of the observer.
Particle Model
a simplification of a complex system using particle representation.
System
the focus of study in an expirement or situation.
Frame of Reference
any method for locating an object in time and space.
Displacement
the change in position of an object
Distance
total path traversed during a given interval of time.
Magnitude
value/size
Vector
any quantity defined by both magnitude and direction
Scalar
any quantity defined by magnitude
Vector Diagram
using vectors to represent displacment within a particle model.
Average Velocity
the rate of change of position of an object
Instantaneous Velocity
the rate of change of position at a given instant in time.
Average Speed
the total distance traveled during a time interval divided by that time
Instantaneous Speed
the magnitude of instantaneous velocity
Motion Diagram
shows the position of an object at successive times.
Time Interval
the difference between two times.
Coordinate System
a system used to describe motion that gives the zero point location of the variable being studied and the direction in which the values of the variable increase
Origin
the point at which both variables have the value zero
Position
the separation between an object and the origin.
Resultant
the vector that represents the sum of the other two vectors.
Position-Time Graph
data can be represented by plotting the time data on a horizontal axis and the position data on a vertical axis.
Instantaneous Position
the position at a particular instant.
Average Acceleration
the rate of change of velocity.
Free Fall
motion of an object solely under the influence of gravity.
Physics
the study of the manner of energy.