Question

Do we apply a force on the ground while walking? (Yes/No)

Answer 1

Newton's third law states that every action has an equal and opposite reaction.

This is relevant to walking because when you put your foot on the ground, you are applying a force to it. In doing this, the ground also actually applies an equal force onto your foot, in the opposite direction, pushing you forward.

Here, you are applying force on the ground in the backward direction, and the ground applies forces on your foot in the forward direction which helps you to walk in the forward direction.