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Please anyone help me dynamic quiz i need it for a test

  1. Nov 5, 2007 #1
    http://www.filefreak.com/pfiles/38439/physics.JPG [Broken]

    need help on question 3 and 4

    I don't understand what to do for those question can anyone show me an message below
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Nov 5, 2007 #2


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    In problem 3, one has a distance of 40 m in which to react then decelerate to a stop.

    One knows the initial velocity 72 km/h (and one should convert to m/s) and a time of 0.6 s, during which some distance is traveled, dreaction. The distance over which the car must decelerate is 40 m - dreaction = dstopping

    One has to determine if the required deceleration exceeds the acceleration (or deceleration) associated with force of friction.

    Reference for equations of motion

    For the pulley problem (or equivalent) -

    General problems for Newton's 2nd law -
    http://hyperphysics.phy-astr.gsu.edu/hbase/N2st [Broken]
    Last edited by a moderator: May 3, 2017
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