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PHY 231
Your 'cq_1_23.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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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: ->->->->->->->->->->->-> :
The air resistance increases.
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• What happens to the net force acting on it?
answer/question/discussion: ->->->->->->->->->->->-> :
The net force decreases
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• What happens to its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
The acceleration is gravity so it stay constant
@& Gravity isn't the only force acting on the object.
If the floor I'm standing on disappeared I would accelerate downward at 9.8 m/s^2 until some other force changed this. However the floor exerts enough force to prevent me from accelerating downward.
The net force on me right now is zero. The normal force exerted by the floor counters the gravitational force tending to accelerate me downward.
The paperwad initially accelerates downward at 9.8 m/s^2, because initially no force other than gravity is involved.
However as you say the net force decreases, and this is due to the increasing air resistance.
What therefore happens to the acceleration of the paper wad?
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• 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 be higher and the acceleration would stay constant because of gravity.
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5 min
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@& You will want to rethink your answers to the last two questions. You should gain some valuable insights in the process, and I don't thinki it will take you long.
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