Question: When a force is called a normal force, it is (a) The usual force expected given the arrangement of a system. (b) A force that

When a force is called a “normal” force, it is
(a) The usual force expected given the arrangement of a system.

(b) A force that is perpendicular to the surface of Earth at any given location.
(c) A force that is always vertical.
(d) A contact force perpendicular to the contact surfaces between two solid objects.
(e) The net force acting on a system.

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