A skateboarder throws a ball away from himself.
If the action force is the boy pushing on the ball, what is the reaction force?
Which way will the boy on the skateboard move?
The reaction force in this scenario would be the ball pushing back on the skateboarder.
The boy on the skateboard will move in the opposite direction of the ball, due to Newton's third law of motion which states that for every action, there is an equal and opposite reaction. Since the boy pushed the ball away from himself, he will move in the opposite direction of the ball.