Question

question 25 of 25 which of the following describes an action - reaction pair? a. you push on a wall, and your feet push on the ground. b. your feet push down on the ground, and the ground pushes up on your feet. c. the suns gravity pulls on you, and earths gravity pulls on you. d. your backpack pulls down on your shoulders, and your feet push on the ground.

Explanation:

According to Newton's third - law, an action - reaction pair consists of two forces that are equal in magnitude, opposite in direction, and act on two different objects. In option B, the force of your feet pushing down on the ground and the ground pushing up on your feet is an action - reaction pair. The action force is your feet exerting a force on the ground, and the reaction force is the ground exerting an equal and opposite force on your feet. In option A, the push on the wall and the push of feet on the ground are not related as an action - reaction pair. In option C, the Sun's gravity and Earth's gravity acting on you are forces on the same object (you) and not an action - reaction pair. In option D, the force of the backpack on your shoulders and the force of your feet on the ground are not an action - reaction pair as they act on different systems and are not related by Newton's third - law.

Answer:

B. Your feet push down on the ground, and the ground pushes up on your feet.