Please help me with this physics question I have a test

Science
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 A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A 140-N force is applied to the box. What is the frictional force on the box?  

May 14th, 2015

Frictional force on the box = 140 N

EXPLANATION:

the force applied needed to move the box is    F= 55*9.8*.3 = 161.7 N which is also the max friction force the surface can provide.  But the force applied in the problem is  140 N. This is not sufficient to move the box. And the friction will apply a force  of 140 N to maintain the box at rest.

Friction force adjusts itself according to the applied force until its limit is reached which in this case is 161.7 N. If a force greater than 161.7 N is applied the box, it would start moving and the friction then acting would be 161.7 N since it can go no higher.

May 14th, 2015

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May 14th, 2015
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