How long was the ice flow in the first tray?
After the ice melted, how was the sand in the first tray different from the sand in the second tray?
What was the sand depth in the first tray at the beginning of the experiment? What was the sand depth at the end? Answer these questions for the second tray.
Did erosion take place in either tray? Explain your answer.
How do you think the results would change if the trays were propped up two inches?

it doesn't. it was imagined up in the middle ages.

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.

force tends to be low and long diustance masses are high