Physics

A block of mass 3m is placed on a frictionless
horizontal surface, and a second block of mass m is placed on top of the first
block. The surfaces of the blocks are rough. A constant force of magnitude F
is applied to the first block as shown in the figure.
(a) Construct free-body diagrams for each block.
(b) Identify the horizontal force that causes the block of mass m to accelerate.
(c) Assume that the upper block does not slip on the lower block, and find
the acceleration of each block in terms of m and F.

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1. the force that causes the upper block to move is friction.

total acceleration:
F=(m+3m)a solve for a. That is the acceleration of both blocks.

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bobpursley
2. 33m.s

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3. b) Kinetic Friction
c) Block 3m: F/3m=a
Block m: F/m=a

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