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Falling objects Air resistance Gravity Gravitational force

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Part 1, each question should be answered separately.

7. Suppose you are in a barrel going over Niagara Falls and during the fall you drop an apple inside the barrel. Would the apple appear to move toward the top of the barrel or toward the bottom, or would it remain stationary within the barrel?

10. (a) Imagine that Charlotte drops a ball from a window on the twentieth floor of a building while at same time Fred drops another ball from a window on the nineteenth floor of that building. As the balls fall, what happens to the distance between them (assuming no air resistance)?

(b) Next imagine that Charlotte and Fred are at same window on the twentieth floor ad that drops hers. As the balls fall, what happens to the distance between them now (again assuming no air resistance)?

15. Distinguish between mass and weight.

16. Albert is standing still on the ground. Does this mean that there is no gravitational force acting on him? If such a force is acting on him, why is he hot moving?

28. A hole is bored to the center of the earth and a stone is dropped into it. How do the mass and weight of the stone at the earth's center compare with their value at the earth's surface?

Part 2

Take a quarter and hold it so that it is parallel to the ground. Let the quarter drop and watch it fall. Then, take a penny and hold it parallel, and drop it from the same height and watch it fall.

Share your findings including the differences in how each item falls (which is the fastest, which is the slowest, etc.). You do not need to include any numbers. Be sure to discuss what effect you think weight and shape have on how fast the items fall.

Part 3

Describe the difference (in both what happens and why) between a person who jumps from an airplane with a parachute and one who jumps without a parachute. If a parachute is used, what would be the difference when the same size parachute is used on a person and then used on an elephant?

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Part 1, each question should be answered separately.

7. Suppose you are in a barrel going over Niagara Falls and during the fall you drop an apple inside the barrel. Would the apple appear to move toward the top of the barrel or toward the bottom, or would it remain stationary within the barrel?

Let v be the speed of the barrel at a given time
My speed with respect to the earth = V me = v,
Apple's speed with respect to the earth = V ae = v
Apple's speed with respect to me = V am = V ae + V em = v - v = 0

Apple will appear to be stationary.

10. (a) Imagine that Charlotte drops a ball from a window on the twentieth floor of a building while at same time Fred drops another ball from a window on the nineteenth floor of that building. As the balls fall, what happens to the distance between them (assuming no air resistance)?
S = ut + ½ at^2
Let the initial speed u = 0 è S = ½ a t^2

Distance traveled by the balls is a function of time and acceleration of gravity. Since the acceleration of ...

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