As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the
A)air resistance acting against the ball.
B)acceleration of the ball.
C)ball's pull on Earth.
D)none of the above

Question

Quizplus · Accepted Answer

The reaction force is always equal and opposite to the action force. In this case, since the action force is the Earth's pull on the ball, the reaction force must be the ball's pull on Earth. The other choices (air resistance and acceleration) are not opposing forces to the Earth's pull on the ball, and therefore cannot be the reaction force.

As a Ball Falls, the Action Force Is the Earth's