A physics textbook of mass m rests flat on a horizontal table of mass M placed on the ground. Let $N_{a - b}$ be the contact force exerted by body 'a' on body 'b'. According to Newton’s 3rd Law, which of the following is an action-reaction pair of forces?

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$N_{ground \to table} and Mg + N_{table \to book}$

$mg and N_{table \to book}$

$N_{ground \to table} and N_{table \to ground}$

$(m + M) g and N_{table \to book}$

answer is D.

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Detailed Solution

In this case the action-reaction pair of forces are actually contact forces acting between surfaces of two bodies in contact in contact.

The pair of gravitational force and normal reaction will not be a action reaction plane.

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