This is an exam review question that I can\'t quite figureout: A block rests on

Question

This is an exam review question that I can't quite figureout: A block rests on a rough horizontal surface with thecoefficient of static friction 0.6 and coefficient of kineticfriction 0.3. A constant horizontal force just sufficient tostart the block in motion is applied. Once the block is inmotion, approximately what is the acceleration of the block inm/s^2? A)10 B)3 C)1 D)9 E)7 This is an exam review question that I can't quite figureout: A block rests on a rough horizontal surface with thecoefficient of static friction 0.6 and coefficient of kineticfriction 0.3. A constant horizontal force just sufficient tostart the block in motion is applied. Once the block is inmotion, approximately what is the acceleration of the block inm/s^2? A)10 B)3 C)1 D)9 E)7

Explanation / Answer

   Force required to make object move    F1   =   s* m * g   =   0.6 * m *9.8   =   5.88 *m      N    Force required to keep objectmoving       F2   =   k *m * g   =   0.3 * m *9.8   =   2.94 *m      N    Net force working onobject   F   =   F1   -   F2   =   5.88* m - 2.94 * m   =   2.94 * m    Acceleration   a   =   F/ m   =   2.94 * m /m   =   2.94   m/s2         ˜   3   m/s2

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