Constant Velocity Model Notes: Physics 9
Name Period 1 2 3 4 5 6 7 Date
Physics Topic
Description
position
A location in comparison to a reference point. Position has size
(number) & direction (+ or - mean left or right etc).
distance
When used carefully, distance = length of the path traveled.
When sloppy, say distance when mean position or displacement.
displacement
Displacement.=”delta d”=Change in position=Δd = df - do
Δd = df - do = d2-d1
displacement=final position(df) - original position (do)
speed
How fast an object changes position.. s=d/t
velocity
How fast and in what direction. Defined as the slope
of a position vs time graph.
Also defined as eqn:
slope
𝑟𝑖𝑠𝑒
𝑟𝑢𝑛
=
𝑦2 − 𝑦1
𝑥2− 𝑥1
steepness of the graph. Means different things
Symbol
shorthand in
equations
Meters, m
d
Where a graph crosses the y-axis. Means different things on different
graphs.
X-Y Scatter Plot
Plot data points on an x and y axis to show their relationship.
Best - Fit Line
A line that best represents all data. Sometimes called a curve-fit, or a
trendline.
Independent
Variable
The variable we manipulate and change.
Dependent
Variable
The variable we observe and measure to record its behavior from our
changes to the independent variable
Graphical
Representation
Representing a physics phenomena or a physics MODEL on a graph.
Diagramatic
Representation
Represent a physics phenomena or a physics MODEL with a diagram
or drawn picture
Mathematical
Representation
Represent a physics phenomena or a physics MODEL with an
equation.
Meters, m
Meters, m
s
𝑚
𝑠
𝑚
𝑠
m
Depends on
what is
graphed.
b
Depends on
what is
graphed.
on different graphs. Slope of d vs t ≡ velocity
y-intercept
Units:
Metric
system
measure
Word Based
Representation
Represent a physics phenomena or physics MODEL with words
describing the relationship between variables.
Representations
Arduino Buggy Lab
Graphical
Representation
Mathematical
Representation
L4-Graphing v vs t
Arduino Buggy Lab
Graph above is a straight line so
𝑦 = 𝑚𝑥 + 𝑏
Replace y & x with axis labels
Slope represent velocity
L4-Graphing v vs t
Lab Reference:
Lab Reference:
Area between v graph & t axis= displacement
Area = Base x Height
Area = Velocity x time
Displacement = Velocity x time interval
Y-intercept represents starting
position
Δd = vΔt
Also written as:
d2 = vΔt + d1
Diagramatic
Representation
Lab Reference:
Arduino Buggy Lab
Dots represent position of object. Arrow represents velocity of object when the object
is at the dot’s position.
Word based
Representation
The buggy starts with a positive position.
When time increases, the buggy’s position
also increases.
Δd = vΔt
Displacement is proportional to velocity
Assumptions of this model:
Any changes in velocity are small enough to ignore.