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 the 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.


D. a contact force perpendicular to the contact surfaces between two solid objects.

Physics & Space Science

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A) more neutrons than protons. B) more neutrons than electrons. C) more protons than electrons. D) the same number of neutrons as protons. E) the same number of protons as electrons.

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