Question
Molecular and quantum physics show that the ____ is the fundamental interaction responsible for contact forces.
Answer
Molecular and quantum physics show that the electromagnetic force is the fundamental interaction responsible for contact forces.
Note: For instance, if a person pushes a book with his finger, the force that moves the book is electromagnetic. Electrostatic repulsion between the atom's in the person's finger and the atoms in the book creates a force that we usually think of as being created by contact. Since it is difficult to think of such contact forces as electromagnetic, we will label them as 'contact forces' instead of electromagnetic forces.
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