Three wooden blocks, each with identical mass, are sitting on a rough surface as shown in Figure 15.5 below. The coefficients of friction between the blocks and the surface are the same for all three blocks. If the same horizontal force is applied to each block, causing each to slide, which one of the following statements is false?
The magnitude of the force of kinetic friction is greater for block 3.
The normal force exerted by the surface is the same for all three blocks.
If the horizontal force is the minimum to start the block moving, then that same force could be used to start any block moving.
The horizontal force required to keep the block moving at constant speed will be the same as the horizontal force required to keep the blocks moving at constant speed.
None of the above statements is false.