Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is
A B C D
balance. friction. gravity. size.
Question: Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is
(A) balance.
(B) friction.
(C) gravity.
(D) size.

Answer: (B) friction.
Answer: (C) gravity.
Question: Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is
(A) balance.
(B) friction.
(C) gravity.
(D) size.
Answer: (B) friction.