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Posted by on Thursday, June 30, 2011 at 11:18am.

A 3 kg block is being pulled by a string at a constant speed on a surface with a coefficient of kinetic friction of 0.3. If the string is at an angle of 30 degrees with the horizontal, what is the magnitude of the force necessary to pull the block?

  • Physics - , Thursday, June 30, 2011 at 4:11pm

    friction force=.3*(3g-Fsin30)


    pulling force=friction=Fcos30

    .9g-.3Fsin30=Fcos30

    .9g=F(.3sin30+cos30)

    solve for F

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