Question 24: A large cube of mass M is accelerated across a level frictionless s

Question

Question 24: A large cube of mass M is accelerated across a level frictionless surface by a finger applying a constant horizontal push P. A small cube of mass m is held in place on the front face of the large cube by static friction. For the previous question, question 24, which of the following, if any, are true and why? (a) The surface over which the large cube slides exerts a force on the large cube parallel to the surface with magnitude equal to P. (b) The surface over which the large cube slides exerts a force on the large cube parallel to the surface with magnitude equal to Mg. (c) The surface over which the large cube slides exerts an upward vertical force on the large cube with magnitude equal to P. (d) The surface over which the large cube slides exerts an upward vertical force on the large cube with magnitude equal to Mg. (e) The surface over which the large cube slides exerts an upward vertical force on the large cube with magnitude equal to (M+m)g. (f) The large cube exerts a force in the horizontal direction on the small cube with magnitude equal to P. (g) The large cube exerts a force in the horizontal direction on the small cube with magnitude less than P. (h) The large cube exerts a force in the horizontal direction on the small cube with magnitude greater than P. (i) The large cube exerts a force in the horizontal direction on the small cube with magnitude equal to mg. (j) The large cube exerts an upward vertical force on the small cube with magnitude equal to P. (k) The large cube exerts an upward vertical force on the small cube with magnitude equal to mg. I think the answers are (i.e. which statements are true): d (maybe), e, f, j (maybe), and k. I am unsure about d and j. Would someone please help me with figuring this out and helping to explain why?

Explanation / Answer

(e) The surface over which the large cube slides exerts an upward vertical force on the large cube with magnitude equal to (M+m)g. (g) The large cube exerts a force in the horizontal direction on the small cube with magnitude less than P. (k) The large cube exerts an upward vertical force on the small cube with magnitude equal to mg. d cant be because, the small block applies some frictional force on the big blocks surface, which adds up for the normal reaction. N> Mg j cannot be. the large force excerts a force equal to mg on the other small block just enough to balance its weight . so , there would be no accn in vertical direction.

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