A block of mass m1 rests on horizontal ground. A block of mass m2 rests on m1. There is no friction between m1 and the ground. There is friction only between m2 and m1. A horizontal force of magnitude F is then applied to m1   Consider the statments: I) the friction force on m2 is to the right. II) suppose that F is small enough for the two blocks to move with the same acceleration a>0. In this case, the friction force is static. III) suppose that F is large enough for the two blocks to move with different accelerations. In this case, the acceleration of m2 relative to the ground is to the left.

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