9/9/2008
1
1
The kinematics of motion
in one dimension
Problemsolving
strategies
Free fall
Chapter 2
Motion in One Dimension
Topics:
2
Different Descriptions of Motion
Motion diagram (student walking to school)
Table of data
Graph
3
Interpreting Graphs
Velocity = slope of positionvstime graph = rise / run
v
=
D
x
D
t
=
x
f

x
i
t
f

t
i
4
Uniform Motion
Straightline motion with equal displacements
during any successive equaltime intervals
L
motion with constant velocity
v
=
D
x
D
t
=
x
f

x
i
t
f

t
i
° D
x
=
v
D
t
°
x
f
=
x
i
+
v
D
t
Demo:
Motion sensor and Ramp
At what point is the object moving fastest,
stopped, speeding up, slowing down. etc.
6
Here is a motion diagram of a car moving along a straight stretch
of road:
Which of the following positionversustime graphs matches this
motion diagram?
Positionvstime graph question
A.
B.
C.
D.
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9/9/2008
2
Here is a motion diagram of a car moving along a straight stretch
of road:
Which of the following velocityversustime graphs matches this
motion diagram?
Checking Understanding
A.
Slide 213
B.
C.
D.
8
Sue moves according to the plot. What are her
instantaneous velocities at
t
=2, 6, & 10 s?
MOTION IN ONEDIMENSION
9
A student drives along a straight road according to the plot.
1)
True or
2)
False
: At
t
= 7 s the student is back at the same position she started
from?
1.
True
2.
False
Checking Understanding
Slide 215
A graph of position versus time for a
basketball player moving down the
court appears like so:
Which of the following velocity graphs matches the above
position graph?
A.
B.
C.
D.
A graph of velocity versus time for a
hockey puck shot into a goal appears
like so:
Which of the following position graphs matches the above
velocity graph?
Checking Understanding
A.
B.
C.
D.
Slide 217
Demo:
Motion sensor and person walking
Can you match the graph