janaschroederj
contestada

a force scale is attached to a stack of books lying on a flat table. What happens to the size of static frictional forces as you begin to pull on the force scale?

Respuesta :

AL2006
Until the stack begins to move, the static frictional force is
exactly equal to the your pulling force. 

We know that because the books are not accelerating, so
the horizontal forces on the stack must be balanced.

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