College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

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 in Figure P4.68. (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.


Figure P4.68


To determine
The free body diagram of each block.


Given info: The masses are m and 3m. The constant horizontal force is F.

The free body diagram for the upper block.

  • N1 is the normal force.
  • Fs is the static friction force.
  • g is the acceleration due to gravity.

The free body diagram for the lower block


To determine
The force causing the upper block to move.


To determine
The acceleration of the blocks.

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