Question

Define Normal reaction force?​

Answer 1

Answer:

When a body lies on the surface of the Earth it is under the influence of gravity. The force on the body due to gravity causes it to exert a force on the ground and the normal reaction acts in the opposite direction causing the resultant force on the body to be zero.

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Answer 2

Answer:

Normal reaction force is generally defined as the the force which acts against the friction (opposite direction of friction)