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    Blank page!

    Coming up: Clicker question!

    http://find/http://goback/

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    Clicker Question: Dr. O. and the uniform-circular-motionball

    The ball is accelerating. We know this because:

    A. The speed is changing.

    B. The direction is changing.C. The speed and direction are both changing.

    http://find/

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    Clicker Question: Dr. O. and the uniform-circular-motionball

    The ball is accelerating. We know this because:

    A. The speed is changing.

    B. The direction is changing.

    C. The speed and direction are both changing.

    http://find/

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    Clicker Question: Dr. O. and the uniform-circular-motionball

    What is the direction of the acceleration of theball?A. Tangent to the circle, in the direction of the balls motion.

    B.Along the string

    , toward Dr. Os hand.C. Toward the center of the circle, along the horizontal dashed line.D. None of the above, or a combination of the above.

    http://find/http://goback/

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    Clicker Question: Dr. O. and the uniform-circular-motionball

    What is the direction of the acceleration of theball?A. Tangent to the circle, in the direction of the balls motion.B. Along the string, toward Dr. Os hand.C. Toward the center of the circle, along the horizontal dashed

    line.

    D. None of the above, or a combination of the above.

    http://find/

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    Example: Computer hard drive

    The disk in a hard drive in a desktop computer

    rotates at 7200 rpm. The disk has a diameter of3.5 inches (8.9 cm). What is the angular speed of

    the disk?

    http://find/http://goback/

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    Example: Computer hard drive

    The disk in a hard drive in a desktop computer

    rotates at 7200 rpm. The disk has a diameter of

    3.5 inches (8.9 cm). What is the angular speed of

    the disk?

    7200 revolutions per minute is7200

    1 minute 1 minute

    60 sec =120

    second.

    At 2

    radians per revolution, this is

    2 rad 120

    second 750 radians/second.

    http://find/

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    Example: Computer hard drive

    The disk in a hard drive in a desktop computer rotates at

    7200 rpm. The disk has a diameter of 3.5 inches (8.9cm). What is the speed of a point on the outer edge ofthe disk?

    v = r

    = 750/second4.45 cm 33 m/s.

    If a disk fails while spinning this fast, the shards from theedge of the disk are going at about 1/10 th the speed ofsound, and about an average pitch speed for a high school

    baseball pitcher.

    http://find/

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    Example: Computer hard drive

    The disk in a hard drive in a desktop computer rotates at

    7200 rpm. The disk has a diameter of 3.5 inches (8.9cm). What is the centripetal acceleration of a point onthe outer edge of the disk?

    a= 2r =v2

    r

    = (750/second)2 4.45 cm 25000 m/s2.

    This is over 2500 g!This is one reason that disks have to be so carefullymanufactured, and so well shielded when spinning.

    http://find/http://goback/

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    Clicker Question: Ranking centripetal accelerations

    What is the correct ranking of the sizes of the

    centripetal accelerations shown?A. aD> aB> aC > aAB. aA = aC > aB = aD

    C. aD> aC > aB> aAD. aA > aB> aC > aDE. None of the above

    http://find/

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    Clicker Question: Ranking centripetal accelerations

    What is the correct ranking of the sizes of the

    centripetal accelerations shown?A. aD> aB> aC > aA B. aA = aC > aB = aD

    C. aD> aC > aB> aAD. aA > aB> aC > aDE. None of the above

    http://find/

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    Blank/warning page! Moving on to forces.

    Coming up: A clicker question

    http://find/

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    Clicker question: Forces are vectors

    Two of the three forces exerted on an object areshown. The net force points directly to the left.

    Which of the F3 is the missing third force?

    http://find/

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    Identifying forces, example 1

    A block (A) hangs from the ceiling by a rope.

    Another block (B) hangs from A. Identify theforces acting on A.

    http://find/

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    Identifying forces, example 1

    A block (A) hangs from the ceiling by a rope.

    Another block (B) hangs from A. Identify theforces acting on A.

    http://find/http://goback/

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    Identifying forces, example 2

    A ball, hanging from the ceiling by a string, is

    pulled to the side, and released so that it swingsback and forth. Identify the forces acting on it

    just after its release.

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    Constant velocity motion

    C

    http://find/http://goback/

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    Constant-velocity motion

    Click to start

    C l i i E l 1

    http://find/

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    Constant-velocity motion, Example 1

    An elevator is going up at a steady speed. What are theforces on the elevator?

    C l i i E l 1 Cli k Q i

    http://find/

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    Constant-velocity motion, Example 1: Clicker Question

    An elevator is going up at a steady speed. Tension and

    weight are identified as the only two forces. Is themagnitude of the tension, Tup, greater than, equal to, orless than the magnitude of the weight, wdown?

    A.Tup

    >

    wdown

    B.Tup


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