[Physltest] [Phys-L] Re: Friction?

["David T. Marx" <dtmarx@ILSTU.EDU>]

You can view the patent information at

http://tinyurl.com/6pfqt

It seems there are two parts to this: an upper part attached to the object you want to "hold" and a
lower part attached to the surface (such as a dashboard).

> Most of us are familiar with the estimation of the coefficient of
> static friction by using an inclined board. One tilts the supporting
> board and finds the angle at which an object starts sliding. The
> tangent of that angle is the coefficient. Yesterday I received a small
> gift. It is called "cell mate." The objects do not slide, even when the
> incline angle approaches 90 degrees. The package gives the US patent
> number (6,673,409) and asi/59525. I also see this: "Non magnetic, No
> adhesives, Washable,  Reusable, Movable." Also "No More Slipping or
> Sliding." The instruction to use (in a car) is simple.
>
> 1) Clean dashboard of dust and wax.
> 2) Slowly remove paper liner from the pad before use [presumably to
> glue the pad to the dashboard].
> 3) Clean pad as needed with soap and water to re-new "grip."
>
> The picture shows a cell phone and a pair of glasses that should not
> slide when the car accelerate. What causes the grip?
> Ludwik Kowalski
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