Two balls have the same shape and size but one is denser than the other. If frictional forces are negligible when they are dropped in air, which has the greater acceleration?
A) The heavier ball
B) The lighter ball
C) They have the same acceleration
D) The heavier ball if atmospheric pressure is high, they lighter ball if it is low
E) The lighter ball if atmospheric pressure is high, the heavier ball if it is low

Question

Quizplus · Accepted Answer

Since both balls have the same shape and size, the only difference is their mass (or density). According to Newton's second law, F=ma, the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. Therefore, when both balls are dropped in air and gravity is the only force acting on them, the heavier ball will experience a greater force and thus a greater acceleration.

Two Balls Have the Same Shape and Size but One