Final answer:
The difference in frictional forces between scenarios would be based on the presence of motion and the type of friction (static or kinetic). Information about the coefficient of friction, the normal force, and the direction of motion is used to calculate and represent these forces.
Step-by-step explanation:
The difference in the frictional force acting on the book in Practice Scenario #5 versus Practice Scenario #6 depends on the nature and circumstances of each scenario which were not explicitly provided. However, generally, we would need to know the movement involved and the types of friction applicable in each situation. For instance, if the book was initially at rest and then moved, the static friction would first resist the motion, which could've been represented in Practice Scenario #5, and when the book was moving, kinetic friction would be acting on it, as might be in Practice Scenario #6.
To determine the frictional force, we would typically use the coefficient of friction which is dependent on the surfaces in contact and the normal force. This information is crucial to calculate the magnitudes using the formulas for static and kinetic friction, respectively. In a situation where the book moves at a constant speed, frictional forces are balanced by other forces, depicting a scenario of no net acceleration.
In free-body diagrams, it is often indicated that the frictional force acts in the direction opposite to the motion of the object. Thus, knowing the direction of motion is essential for correctly representing friction in free-body diagrams.