This is physics lab friction. Explaincorrectly question2 and 3 a and b . EXPERIMENT2. Speculate, in terms of the microscopic surface irregularities, about why k < /, and whatLaboratory Reporteffect a lubricant has on the coefficient of friction.3. (a) Prove that tan 0 is equal to Mk when the block slides down the incline with a constantspeed. (Use symbols, not numbers.)(b) If 0 is the maximum angle of incline just before the block moves, what is us in termsof 0?made to move up the inclined plane with a uniform speed byfficient of