Question

Describe our walking in terms of Newton's third law of motion

Answer 1

According to Newton's 3rd l every action has equal and opposite reaction

So when we walk we push the floor backward which is action and the pushes our foot forward which is reaction

hope this will help you

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Answer 2

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Friction supplies the support force which is necessary for a body to walk.

Friction is necessary for walking because as per the Newton's third law of motion, (every action has an equal and opposite reaction), therefore, we can walk only if the ground we are walking on push our feet back with a force.

Now, here fiction comes out and helps us by providing the necessary reaction force. As per the third law, the ground would definitely push our feet back if we are walking on a perfectly smooth ground which has no friction our force would simple cancel out the force reverted by the ground and we would fall.