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    Friction problem involving 2 blocks sliding in 2 directions with 2 frictions

    Homework Statement http://streetrodjohn.home.comcast.net/~streetrodjohn/physics.jpg A 1-kg block is pushed against a 4-kg block on a horizontal surface of coefficient of friction 0.25, as shown in the figure. Determine the minimum force needed to ensure that the 1-kg block does not slip...