As a ball falls, the action force is the pull of Earth on the ball. The reaction force is the Physics As a ball falls, the action force is the pull of Earth on the ball. The reaction force is the A) air resistance acting against the ball. B) acceleration of the ball. C) pull of the ball's mass on the Earth. D) none of these Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+