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# Contact Forces: Electrostatic Forces

APPH12-JGM4ZY

A crate is pulled horizontally by a tight cable across a rough surface.

Which of the forces shown in the diagram is NOT a result of electric forces acting on a large scale?

A

${ F }_{ normal }$ , the force perpendicular from the surface on the crate.

B

${ F }_{ friction }$, the force parallel to the surface on the crate.

C

${ F }_{ tension }$, the force pulling the crate horizontally.

D

${ F }_{ gravity }$, the force of the earth pulling down on the crate.