Question

What do you mean by normal reaction?

Answer 1

The force exerted by a surface on an object in contact with it which prevents the object from passing through the surface; the force is perpendicular to the surface, and is the only force that the surface exerts on the object in the absence of frictional forces.

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Answer 2

Answer:

Normal reaction is the contact force between two bodies which are in contact with each other. For example, [refer to the attached image] mass (m) exhibits a normal reaction i.e. contact force on the ground and ground exhibits a normal reaction on the mass.

Extra Information:

(1) Normal Reaction is also referred to as contact force.

(2) Normal reaction is always in a pair.

(3) Normal reaction is always perpendicular to contact.