You are out in space, so far from any star or planet that gravity is insignificant. You throw two rubber balls so that they drift forward as a pair. These balls continue to touch one another with one ball directly in front of the other. Which of the balls is pushing on the other?
A. The ball in front is pushing backward on the ball behind and the ball behind is pushing forward on the ball in front.
B. Only the ball behind is pushing forward on the ball in front.
C. Only the ball in front is pushing backward on the ball behind.
D. Neither ball is pushing on the other.
Answer:D
You are out in space, so far from any star or planet that gravity is insignificant. You throw two rubber balls so that they drift forward as a pair. These balls continue to touch one another with one ball directly in front of the other. Which of the balls is pushing on the other?
A. The ball in front is pushing backward on the ball behind and the ball behind is pushing forward on the ball in front. B. Only the ball behind is pushing forward on the ball in front. C. Only the ball in front is pushing backward on the ball behind. D. Neither ball is pushing on the other.