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What is a normal force? It acts perpendicular to an object. It acts against an object slowing it down. It acts with an object adding to its speed. It acts parallel to an object.​
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What is a normal force? It acts perpendicular to an object. It acts against an object slowing it down. It acts with an object adding to its speed. It acts parallel to an object.​

User Rivimey
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HI, in mechanics, the normal force is the component of a contact force that is perpendicular to the surface that an object contacts.
So the answer is A. It acts perpendicular to an object.
Hope this helps!
User Will Abson
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