Acceleration Lecture
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Transcript of Acceleration Lecture
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8/11/2019 Acceleration Lecture
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Starter Questions
Wednesday:The graph depicts the speed of two vehicles:1. Which line graph is the faster one?2. Which line graph is the slower one?
AB
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Velocity
V = velocity (meters/second)
d = distance (meters)t = time (seconds)
d
V =
tspeed of an object in acertain direction.
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How much time will ittake a car driving avelocity of 50 miles/hr
east to drive 300miles?
(Remember: t = v/d)
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How would you describe the motion offloating balloons?
Do they move in a constant speed or
direction?
The movement of a balloonis a great example of an object
Accelerating!
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Uniform Circular Motion
Figure 9 pg 329 Would a windmill traveling in a circle at a
constant speed be accelerating?
Direction; Are you accelerating, now?
http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/
http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/http://www.pbs.org/opb/circus/classroom/circus-physics/activity-guide-centripetal-acceleration/ -
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Accelerationhow quickly velocity changesover time.
A = (Vfinal - Vinitial )
time
___________
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Acceleration = A change in Velocity
][][
2 sm
TimeVelocityon Accelerati T A
V
You already learned theVelocity equation:
Here is the equation for Acceleration:
][][
sm
Timecetan Dis
Velocity
Means change
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Question
During a race, a runners velocityincreases from 0 m/s to 4 m/s over aperiod of 2 s. What is the bicyclesaverage acceleration during this period?
a= 4m/s-2m/s = ________m/s/s2s
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Constant Velocity
1 2 3 4 5
A characteristic of constant velocity is that all distances between seconds are
the same.
Time [Sec]
D i s t a n c e [ m
]
1s slow
1.2m
2s slow
2.4m
3s slow
3.6m
0 1 2 3 4 5
6
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Question
What would the graph look like for a carslowing down to a stop?
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Time
Interpreting Acceleration on a Graph
5 m
15 m
10 m
15 s10 s5 s
D i s
t a n c e
D i s
t a n c e
Positive
Acceleration in anegative direction
Negative Acceleration in a
Positive direction
Flat line = Novelocity, so noacceleration
http://onlinelearningexchange.com/texas_demo/grade8.html
http://onlinelearningexchange.com/texas_demo/grade8.htmlhttp://onlinelearningexchange.com/texas_demo/grade8.html -
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Question
What kind of graph will a negativeacceleration produce?
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Time
Interpreting Acceleration on a Graph
5 m
15 m
10 m
15 s10 s5 s
D i s
t a n c e
D i s
t a n c e
Positive
Acceleration in anegative direction
Negative Acceleration in a
Positive direction
Flat line = Novelocity from thePOR
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Lesson Extensions
Falling Pumpkins http://www.physicsclassroom.com/mm
edia/vectors/mzs.cfm http://www.onlinemathlearning.com/velocit
y-acceleration.html http://dev.physicslab.org/Document.aspx?
doctype=5&filename=Kinematics_Uniform AccelerationVelocityTimeGraphs1.xml
Simon Says Accelerate
http://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.onlinemathlearning.com/velocity-acceleration.htmlhttp://www.onlinemathlearning.com/velocity-acceleration.htmlhttp://dev.physicslab.org/Document.aspx?doctype=5&filename=Kinematics_UniformAccelerationVelocityTimeGraphs1.xmlhttp://dev.physicslab.org/Document.aspx?doctype=5&filename=Kinematics_UniformAccelerationVelocityTimeGraphs1.xmlhttp://dev.physicslab.org/Document.aspx?doctype=5&filename=Kinematics_UniformAccelerationVelocityTimeGraphs1.xmlhttp://dev.physicslab.org/Document.aspx?doctype=5&filename=Kinematics_UniformAccelerationVelocityTimeGraphs1.xmlhttp://dev.physicslab.org/Document.aspx?doctype=5&filename=Kinematics_UniformAccelerationVelocityTimeGraphs1.xmlhttp://dev.physicslab.org/Document.aspx?doctype=5&filename=Kinematics_UniformAccelerationVelocityTimeGraphs1.xmlhttp://www.onlinemathlearning.com/velocity-acceleration.htmlhttp://www.onlinemathlearning.com/velocity-acceleration.htmlhttp://www.onlinemathlearning.com/velocity-acceleration.htmlhttp://www.onlinemathlearning.com/velocity-acceleration.htmlhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfmhttp://www.physicsclassroom.com/mmedia/vectors/mzs.cfm -
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Acceleration
With Acceleration, Notice the differenceof distance with the red acceleration lines
between each second?
1sec
1 0m
2sec
3m
1 2