試題詳解

47. Two blocks are accelerated across a horizontal frictionless surface as shown below. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the small block on the large block?
  
(A) 0.48 N to the right 
(B) 0.72 N to the right
(C) 0.72 N to the left
(D) 0.48 N to the left
(E) 0.65 N to the left