Block A weighs 1.20 N and block Bweighs 3.60 N. The coefficient of kinetic frictionbetween all surfaces is 0.300. Find the magnitudeof the h

Question

Block A weighs 1.20 N and block Bweighs 3.60 N. The coefficient of kinetic frictionbetween all surfaces is 0.300. Find the magnitudeof the horizontal force F necessary to drag blockB to the left at constant speed a) if A rests on Band moves with it and b) if A is held at rest.

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Eirian 1 year 2021-07-31T12:34:50+00:00 1 Answers 10 views 0

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    2021-07-31T12:35:54+00:00

    Answer:

    Explanation:

    a )  In this case A rests on B and both rest on horizontal surface

    Both moves together .

    Total reaction due to weight of both of them

    R = 1.2 + 3.6 = 4.8 N

    friction force by horizontal surface = μ R , μ is coefficient of friction .

    = .3 x 4.8 = 1.44 N

    Force equal to frictional force will be required to put both of them in uniform motion .

    b ) If A is held stationary , friction force will arise at both , the upper and lower surface of B .

    At upper surface friction force =  μ x weight of A

    = .3 x 1.2 = .36 N

    At lower surface friction force = μ x weight of A +B

    = .3 x 4.8

    = 1.44

    Total frictional force on B

    = 1.8 N  N .

    So 1.8 N force will be required to put B in uniform keeping A stationary.

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