A 1.83 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficie

Question

A 1.83 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240 . How much force is needed to begin moving the book?

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Eirian 4 years 2021-08-21T04:54:31+00:00 1 Answers 118 views 0

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  1. thienan
    1
    2021-08-21T04:55:42+00:00
    Reply

    Answer:7.92 N

    Explanation:

    Given

    mass of book m=1.83\ kg

    coefficient of static friction \mu _s=0.442

    coefficient of kinetic friction \mu _k=0.240

    To move the book, one need to overcome  the static friction  

    Static friction F_s=\mu _sN

    F_s=\mu _s\times 1.83\times 9.8

    F_s=0.442\times 1.83\times 9.8

    F_s=7.92\ N

    After overcoming the Static friction , Force needed to move the block is

    F_k=\mu _kN

    F_k=0.240\times 1.83\times 9.8

    F_k=4.30\ N

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