A force is defined as a push or pull. It is also defined as something that accelerates objects. If a single force acts on an object, its acceleration is found to be in the same direction as the force. If more than one force acts on an object, its acceleration is the direction of the vector sum of the forces. A normal force is perpendicular to the surface and is only acting upon an object when the object is on top of a surface, not in mid air or anything like that. The normal force occurs because when an object is upon a surface it causes a small force upon the surface of the countertop, just as the countertop does the same to the bottom of the object.
Great explaination was very thorough and easy to understand. The diagrams were easy to follow too:)
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