Question

A man waves his arm while walking. This is ____________

(a) To keep constant velocity

(b) To ease the tension

(c) To increase the velocity

(d) To balance the effect of earth’s gravity

I have been asked this question in examination.

I would like to ask this question from Mass and Density of the Earth in portion Mechanical Properties of Solids of Engineering Physics I

Answer 1

Right answer is (d) To balance the effect of earth’s gravity

Easy explanation: The waving of the arm helps in keeping the centre of gravity at a suitable position. This helps the man to walk comfortably.