Force is a vector, as such we know that the force required to crack a nut is the resultant of the individual forces applied form all sides of the nut.
The term force is used to describe that which causes a change in the position of an object. Now the question is incomplete but I will try to help you the much I can.
Recall that force is a vector quantity. Hence the magnitude of the force required to crack a nut is the resultant of the individual forces applied form all sides of the nut.
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