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(D) The limiting value of static friction $(f_{s,max})$ is defined by the relation $f_{s,max} = \mu_s N$,where $\mu_s$ is the coefficient of static fr

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All of these.

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(D) The limiting value of static friction $(f_{s,max})$ is defined by the relation $f_{s,max} = \mu_s N$,where $\mu_s$ is the coefficient of static friction and $N$ is the normal force. $1$. Since $f_{s,max} \propto N$,it is proportional to the normal force between the surfaces in contact. $2$. Experimental observations show that friction is independent of the apparent area of contact as long as the normal force remains constant. $3$. At a microscopic level,the actual area of contact is much smaller than the apparent area and depends on the surface roughness and deformation,which influences the value of $\mu_s$. Therefore,all the given statements are correct.

The limiting value of static friction between two contact surfaces is ...........

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