Concept explainers
A second book of greater mass is placed on top of the first.
Sketch a free-body diagram for each of the book in the space below. Label all the forces as in part A.
Specify which of the forces are contact forces and which are non-contact.
1. Examine all the forces on the two free-body diagram you just drew. Explain why a force that appears on one diagram should not appear on the other diagram.
2. What type of force does the upper exert on the lower book (e.g., frictional, gravitational)?
Why would it be incorrect to say that the weight of the upper book acts on the lower book?
3. What observation can you make that allows you to determine the relative magnitudes of the forces on the upper book?
4. Are there any forces acting on the lower book that have the same magnitude as a force acting on the upper book? Explain.
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