Question

Book kept on a table is an example for ___________

(a) Inertia

(b) First law of motion

(c) Third law of motion

(d) Second law of motion

I got this question by my college director while I was bunking the class.

My enquiry is from Effect of Gravity in section Laws of Motion of Engineering Physics I

Answer 1

Right choice is (c) Third law of motion

Explanation: The book exerts a downward force on the table equal to its own weight. According to Newton’s third law, the table also exerts an equal and upward force on the book. As the book is under the action of two equal and opposite forces, it remains in equilibrium.