Passage VI
An object falling through a liquid has 3 forces acting on it: gravity, a buoyant force, and drag (a force that opposes motion). If the net upward force on the object is equal in magnitude to the net downward force on the object, then the object will fall at terminal speed.
A steel ball was dropped from rest into a column of motor oil and into a column of glycerin. Figures 1 and 2 show how the speed of the ball and the drag on the ball varied with time as the ball fell through the oil and through the glycerin, respectively. Figure 3 shows how the depth of the ball varied with time for each case.
38. According to Figures 1 and 2, the steel ball’s terminal speed was greater in which liquid?
Your Answer is
Correct Answer is F
Explanation
When the speed reaches a constant value, the terminal speed is reached;
Comparing figure 1 & figure 2, it is found that the terminal speed in figure 1 is larger, that is, in motor oil
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