I.
INTRODCUTION
A. Objective:
The purpose of this lab was to understand the relationship between Position, Velocity and
Acceleration and gain familiarity with collecting position data using a computer observe the back
forth motion of a five objects and qualitatively analyze the motion of object that move back and
forth. Also analyze and interpret the back and forth motion in the kinematic graphs and use the
kinematic graphs to catalog the objects that exhibit similar motion.
B. Theory:
The definition of “kinematics” is the study of the motion of objects using words,
equations, graphs and diagrams and numbers. Kinematics is a study aimed at explaining the
motion of objects.
The “Kinematic Equations” all have four variables. If you know three of the variables then you
can always calculate the fourth. These equations can predict an object’s motion. The four
equations use the following variables; displacement of the object, the time the object was
moving, the acceleration of the object, the initial velocity of the object and the final velocity of
the object.
In physics, Position is the location of an object measured relative to the origin. In this
experiment, the position of the object is the same as the object's
distance
as measured
from motion sensor which uses sound waves to locate the object. Displacement is the
change
in position
∆
x
=
x f
−
xi
, and can be both positive or negative.
Average velocity is the change in displacement divided by change in time
=
v ∆x∆t
. The slope
between any two points in the x vs. t plot is the average velocity. Average acceleration is the
change in velocity divided by change in time.
a
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 Fall '10
 johnson
 Physics, Acceleration, Velocity, Motion detector

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