A stack of books placed on a table will not be displaced due to:
Inertia
Inertia is the tendency of a body to remain in its state of rest or of uniform motion unless an external unbalanced force acts on it. This is Newton's first law of motion.
A stack of books lying on a table is at rest, and because of inertia of rest it stays there without being displaced until some external force pushes or pulls it.
Momentum is the product of mass and velocity and is zero for a body at rest; magnetism plays no role here; and gravity only presses the books down onto the table, it does not explain why they resist being moved.
Hence, Inertia.
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