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Homework Statement
A vertical spring is fixed on a table. A book is put on the spring. The book compresses the spring until static equilibrium is reached. Question: Is there a normal force exerted by the spring on the book? Why or why not?
Homework Equations
The Attempt at a Solution
I think there is because normal force is a contact force. As long as two bodies are in contact, I think it exists. But I never see books mention normal force in this kind of problem.