Question

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the force is the perpendicular contact force that a surface exerts on another surface.
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Explanation:

The normal force is a fundamental concept in physics. It is defined as the perpendicular contact force that a surface exerts on another surface. For example, when a book is placed on a table, the table exerts a normal force upward on the book to counteract the force of gravity (the weight of the book) acting downward. This force is always perpendicular to the surface.

Answer:

normal