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Homework Help: How to find Static Friction

  1. Oct 15, 2008 #1
    How would I find static friction given the following information:

    V= 45km/hr
    Time to decelerate completely from 45km/hr: 3.5s

    The motion of the object given is of a moving vehicle. There is a cup on the dashboard inside the vehicle that moves only when deceleration time is less than or equal to 3.5s. From this information how could I solve for static friction between the cup and the dashboard?

    I started by converting the velocity to m/s and found the acceleration to be be 3.57m/s^2 in the negative x direction. I do not know how to go from here...please help.
  2. jcsd
  3. Oct 16, 2008 #2


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    How is static friction defined. The maximum static friction force must occur when the cup is subject to the acceleration of 3.57 m/s2.
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