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I decided to make the object slide by increasing the angle between book(the surface) and table. Finally object started sliding and I measured the angle([tex]\alpha[/tex]). And finally I got: [tex]\mu[/tex]= tan[tex]\alpha[/tex].

G

_{x}= sin[tex]\alpha[/tex]*G

Then I realised that the angle [tex]\alpha[/tex] is the angle when G

_{x}>F

_{f0}(read:the maximum of static friction)

But isn't F

_{f}< F

_{f0}.

So is this task even possible(without measuring the mass of the object or/and the acceleration) or what am I doing wrong?

P.S English isn't my first language! :)