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- Mar 10, 2008
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Guys, I'm having issues understanding this. Someone on 4/10/08 posted the question of: if you throw a small ball vertically upward in real air with air resistance, does it take longer to go up or come down?
See, if I write the equations out like BloodySurgeon did...
Mg + Air resistance = ma (Ascent)
Mg - Air resistance = ma (Descent)
...it makes sense. However, when I draw a picture, I can't convince myself why the descent would take longer. If on the ascent the direction of motion is being opposed by two forces, whereas on the descent it's only being opposed by one, air resistance, and is in the same direction of gravity, then why wouldn't the ASCENT take longer?
It's seriously making me nuts that I can't grasp this.
Wouldn't you want as many as forces as possible in the same direction of motion???
See, if I write the equations out like BloodySurgeon did...
Mg + Air resistance = ma (Ascent)
Mg - Air resistance = ma (Descent)
...it makes sense. However, when I draw a picture, I can't convince myself why the descent would take longer. If on the ascent the direction of motion is being opposed by two forces, whereas on the descent it's only being opposed by one, air resistance, and is in the same direction of gravity, then why wouldn't the ASCENT take longer?
It's seriously making me nuts that I can't grasp this.
Wouldn't you want as many as forces as possible in the same direction of motion???