Is contact force equals to normal reaction in every situation?
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it's magnitude will be same as that of the force exerted and it will be perpendicular to the surface of contact of the two bodies. Newton's Third Law of Motion - For every action, there is an equal and opposite reaction. Take gravity for example.
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it is true that normal force is not a reaction force of gravity because when a body is in air then also gravity acts on it but no reaction force acts on it and also on a inclined plane that is why in general the magnitude of normal reaction is equal to the gravitational force.
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