: Use the following information for the remaining multiple-choice questions: Whe
ID: 1332976 • Letter: #
Question
: Use the following information for the remaining multiple-choice questions: When an object with mass m is dropped near the surface of Earth, it will fall to the ground due to the force of gravity. Near the surface the force of gravity, F, can be determined from the following equation: F = m g where g is the acceleration due to gravity (g = 9.8 m/s2 ). In the presence of air, a falling object will also experience an air resistance, Fa, which opposes the motion of the object. The net force on an object with mass m falling through the air near the surface of Earth is thus given by: Fnet = m g - Fa The air resistance, Fa, depends on such factors as the speed, size, shape, and surface texture of the object
20. The scientist wants to investigate the effect of size and surface texture on the air resistance. She designs an experiment using a smooth sphere with a small diameter, a rough sphere with a small diameter, and smooth sphere with a larger diameter. Which sphere is her control? A) The smooth sphere with the small diameter B) The rough sphere with the small diameter C) The smooth sphere with the larger diameter D) Neither. The experiment is not controlled.
Explanation / Answer
The control is the element against the comparisons are made, in this case the comparisons should be made versus the small díameter and smooth sphere, this way you can Model the fluctuations regarding the size and the texture. A comparison between the smooth small sphere and big sphere must be made, also one with the small smooth and rough sphere to determine the variations due to texture
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