Question

Question 24:
Explain why, a runner presses the ground with his feet before he starts his run.

Lakhmir Singh Physics Class 9

Answer 1

" For every action , there is an equal and opposite reaction ".
Action=-Reaction

-->So when the runner pushes the ground[action force] he experiences an equal and opposite reaction force from the ground which he utilizes to run faster.

--->The harder  he pushes the ground, more reaction force he gets which helps him to move forward.

Answer 2

Answer:Using the Newtons's third law of motion - "For every action there in an equal and opposite reaction". The runner presses the ground with his feet before he starts his run in turn the ground deploy a reaction force on the runner in the forward direction to help him run.

Explanation: