A student did an experiment to see how much candy she should use to make rock candy. She made one solution that had 3 parts sugar to one part water (3:1), and another solution that had one part sugar to one part water (1:1). She measured how many grams of candy was formed. The results are on the chart below What were the variables that the student need to control in this investigation? (check all that apply)
A. the temperature in the room
B. how hot the water was that she used
C. how much food coloring she used
D. the amount of sugar used

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air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.