Please show step by step solution and formulae you use Rather than taking the st

Question

Please show step by step solution and formulae you use

Rather than taking the stairs, Martin gets from the second floor ofhis house to the first floor by sliding down the banister that isinclined at an angle of 30 degrees to the horizontal. If Martin hasa mass of 45kg and the coefficient of sliding friction betweenMartin and the Bannister is 0.20, what is the force of frictionimpeding Martin's motion down the bannister?

I know the answer is around 78 N. I think I am trying to find whatmy teacher calls Ff, Force of Friction which goes against Martin. Iknow Ff = (Fgravity)(cos 30), and since Fgravity = mg I canreplace it so it's Ff = (45 x 9.81)(cos 30)

...Then I realized I don't know and I am now stuck. Pleasehelp. I think I am missing a key point of information, orsomething.

Explanation / Answer

. 01.   = coefficient of sliding friction =0.20 02.   Ff = (0.20)*(45 kilograms)*(9.81m/s2)*cos(30 degrees) = 76.461 Newtons .

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