Phy 121
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A wad of paper is dropped from a second-story balcony and falls through still air to the ground.
• As it speeds up, what happens to the air resistance it encounters?
answer/question/discussion: ->->->->->->->->->->->-> : Since F=m*a, the air resistance will increase.
• What happens to the net force acting on it?
answer/question/discussion: ->->->->->->->->->->->-> : Gravity will be pushing down with greater force as it gets closer to the ground, and air resistance will increase with acceleration, so I don’t think the net force will change since a negative force and positive force are both increasing seemingly proportional for such a short distance.
• What happens to its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> : It will accelerate at a decreasing rate, though I don’t know if that will really be noticeable over 20 or so feet.
• If it dropped from a much higher point, what would happen to the net force and the acceleration?
answer/question/discussion: ->->->->->->->->->->->-> : The net force would decrease since the force from wind resistance would increase more than the force from gravity.
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15min
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Good, but if you're within the atmosphere gravitational acceleration won't vary by much. See the link for a fuller discussion:
&#Please compare your solutions with the expanded discussion at the link
Solution
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