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