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You Must Read This First Aid For Babies

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Normal Force: The upward force which acts upon an object resting on a horizontal surface, balancing the force of the weight of the object. In this picture the normal force balances with the boxes weight

In mechanics, the normal force is the component, perpendicular to the surface (surface being a plane) of contact, of the contact force exerted on an object. This picture shows the normal force being created when the box makes contact with the floor.