Describing Motion with Position-Time Graphs - Mr. Kiser's 8th Grade IPC ...
Motion in One Dimension
Name:
Describing Motion with Position-Time Graphs
Read from Lesson 3 of the 1-D Kinematics chapter at The Physics Classroom:
MOP Connection:
Kinematic Graphing: sublevels 1-4 (and some of sublevels 9-11)
Motion can be described using words, diagrams, numerical information, equations, and graphs. Describing
motion with graphs involves representing how a quantity such as the object's position can change with respect to
the time. The key to using position-time graphs is knowing that the slope of a position-time graph reveals
information about the object's velocity. By detecting the slope, one can infer about an object's velocity. "As the
slope goes, so goes the velocity."
Review:
1.
Categorize the following motions as being either examples of + or - acceleration.
a.
b.
c.
d.
Moving in the + direction and speeding up (getting faster)
Moving in the + direction and slowing down (getting slower)
Moving in the - direction and speeding up (getting faster)
Moving in the - direction and slowing down (getting slower)
positive
negative
negative
positive
Interpreting Position-Graphs
2.
On the graphs below, draw two lines/curves to represent the given verbal descriptions; label the
lines/curves as A or B.
A
B
Remaining at rest
Moving
A
B
Moving slow
Moving fast
B
B
(sloped)
Moving at constant speed A
Accelerating
B
B
(more
sloped)
A
Move in + dirn; speed up
Move in + dirn; slow dn
A
B
Move in - dirn; speed up
Move in - dirn; slow dn
B
B
A
3.
Moving in + direction
Moving in - direction
A
A (horizontal)
A
B
A
B
A
A
B
For each type of accelerated motion, construct the appropriate shape of a position-time graph.
Moving with a + velocity and a + acceleration
positive
slope
(getting
steeper)
? The Physics Classroom, 2009
Moving with a + velocity and a - acceleration
positive slope
(getting flatter)
Page 1
Moving with a - velocity and a + acceleration
Negative slope
(getting flatter)
4.
5.
Moving with a - velocity and a - acceleration
Negativ
e slope
(getting
steeper)
Use your understanding of the meaning of slope and shape of position-time graphs to describe the motion
depicted by each of the following graphs.
The object moves with a constant velocity in
the positive direction; then the object suddenly
stops and maintains a rest position.
The object moves slowly with a constant
velocity in the positive direction; then the
object moves fast with a constant velocity.
The object moves in the positive direction from
slow to fast. Then the object maintains a
constant velocity in the positive direction.
The object moves in the positive direction from
fast to slow; once the object slows to a stop, it
maintains the rest position.
Use the position-time graphs below to determine the velocity. PSYW
v = slope = rise/run = (20 m)/(5.0 s)
v = 4 m/s
v = slope = rise/run = (20 m)/(5.0 s)
v = 4 m/s
v = slope = rise/run = (-25 m)/(5.0 s)
v = -5 m/s
v = slope = rise/run = (-20 m)/(5.0 s)
v = -4 m/s
? The Physics Classroom, 2009
Page 2
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