Consult Multiple-Concept Example 9 to explore a model for solvingthis problem. A

Question

Consult Multiple-Concept Example 9 to explore a model for solvingthis problem. A person pushes on a 61-kg refrigerator with ahorizontal force of -260 N; the minus sign indicates that the forcepoints in the -x direction. The coefficient of staticfriction is 0.71. (a) If the refrigerator does notmove, what are the magnitude and direction of the static frictionalforce that the floor exerts on the refrigerator?(b) What is the magnitude of the largest pushingforce that can be applied to the refrigerator before it just beginsto move? Assume g = 9.81 m/s2.

Explanation / Answer

person pushes on a 61-kg refrigerator with a horizontal forceof -260 N (a)If the refrigerator does not move, from the 3rd Law ofNewton we get the magnitude of the static frictional force=260 N, having the samedirection with x-axis (b)the magnitude of the largest pushing force that can beapplied to the refrigerator before it just begins to move F=m*g*0.71=427.5N

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